Hello,
my gps has no right position i think the difference is between 25 to 50 m
Is there a tool to correct this issue ?
Thx
Nochmal in deutsch falls mein Englisch nicht so gut zu verstehen ist
Mein GPS im Artemis hinkt etwa 25 bis 50 m hinterher was sehr nervig ist
Kennt jemand dieses Problem und weiß wie man Abhilfe schafft ?
From what I recall no civilian GPS is precisely correct.
Only Military GPS is precise to the metre.
Not sure what the exact varience is though.
Regards
i have navigation systems before the p3300 and on all when the street cross comes it brings exactly the position when it says turn left at 50m then it was correct, i believe the military difference is only 1m or lower not 50m ???
For external PC gps receiver there is a software for correct some options for the inbuild gps.
I have no glue for a in built gps.
Sorry for the English this not my normal language, i hope you can understand what i mean thanks
Also, better accuracy depends on the number of satellite signals the device can get. Signal strength is weaker in the urban areas.
What software application are you using when you notice the discrepancy? I have found my Artemis GPS position to be equal to some of my other units. For example using a topographical map when out walking the unit is very good, certainly not 25 to 50 M out. It could be low signal strength and reflections off other building that is causing a problem (if in built up area)
One other consideration, how many other applications do you have running at the same time as your Nav software, your device might be struggling under load, check settings/ system tab Memory icon/ running programs and stop all before trying the nav software Mike
My device, which is still the Magician is running the ROM 1.13 with BS. Additional software which are all installed in the Storage are; Pocket Informant, Photo Contacts Pro, Resco Suit, SK Tools, TT6, WorldMate Pro, Ring tones. All TT maps (WEU, USA+Canada), voices, schemes, zip codes, POIs and IE Temporaty files are installed in a 2GB SD. What's left in available memory are Storage = 0.7 of 26.72 MB, Storage Card = 105 MB of 1935GB.
The programs that are running (being memory resident) while TT6 is active are Photo Contacts Pro and Pocket Informant. I have BT on all the time since I use a BT headset for calls while driving. TT audio is via my Seidio active car holder.
The programm ist TT6 and only jetware, and ilauncher active nothing more, the area is no big city good sight to the air.
I checkt this with tt5 and a hp2210 with bluetooth sirfIII this combination is near perfect
I've never used those programs. The inaccuracy might come from any of the two.
Civilian GPS is officially (from the provider of the GPS System - US Forces) something about 10 metres unexact. Of course this number can be smaller if you have more satelites "in sight" However, GPS Navigation Programs do not need accurate positions, they calculate the position on the map with old data and then extrapolate it, showing the dot where you should be now, according to your speed and heading 1 second or two seconds ago. Of course it can control its calculation because more data streams in. It is funny to see Navigationsoftware Confused, when you ride a train. It gets a signal in a certain direction, with a certain speed, so it puts the dot on the street next to the Rails, because this is the only logical position where your car can be so it says "turn left now" but the train goes straight. Then it searches another street you could be on. just funny
But in short: GPS Software compensates missing GPS accuracy, mostly well, sometimes not so good. Try using another Software or newer map ,maybe that will fix the problem. On my MDA Compact III The Built in Receiver works just great together with TT6. Maybe there is a way to shorten the interval between two data sets. That would give the Software more information, resulting in a more accurate position. But i don't know if a program like GPS Maus can manipulate Built-In receivers that easy.
I once reprogrammed a T-Mobile Receiver with this program, so it received also NMEA data and the intervall between two data sets could be set randomly.
In the UK, the BBC send out a spoiling signal which reduces the accuracy of the GPS. It is also sent out from National stations in other Countries. I heard it was sent out with the atomic clock signal. This is to stop "undesirables" buying civilian GPS units and fitting them to military equipment and sending something directly to your letterbox - the same way a US military GPS unit can if they want to! You used to be able to buy a box that would correct the error signal, but that got stopped ages ago.
The GPS also becomes slightly more inaccurate depending on the speed you are travelling, travel under 30 mph / 50 kph and the "you have arrived" will be within a few yards/metres of the real arrival point. Travel at 70 mph / 120 kph and the "take the exit in 200 metres" is very inaccurate - maybe by a couple of hundred metres - you can work out why!
Also GPS signals are "secondary" and can be turned off at any time in the event of a military requirement - which is why you can use the signals free of charge.
Jeff
jthspace said:
In the UK, the BBC send out a spoiling signal which reduces the accuracy of the GPS. It is also sent out from National stations in other Countries. I heard it was sent out with the atomic clock signal.
Click to expand...
Click to collapse
Where did you get this gem of knowledge from?
jthspace said:
This is to stop "undesirables" buying civilian GPS units and fitting them to military equipment and sending something directly to your letterbox - the same way a US military GPS unit can if they want to! You used to be able to buy a box that would correct the error signal, but that got stopped ages ago.
Click to expand...
Click to collapse
Are you confusing the selective availability that was used to degrade the GPS accuracy up to a few years ago? - The US reserve the right to switch it back on again should they need to, but under normal conditions the signal is not de-graded any longer. If you want to send something to a letterbox the Post Office offer quite a good service
jthspace said:
The GPS also becomes slightly more inaccurate depending on the speed you are travelling, travel under 30 mph / 50 kph and the "you have arrived" will be within a few yards/metres of the real arrival point. Travel at 70 mph / 120 kph and the "take the exit in 200 metres" is very inaccurate - maybe by a couple of hundred metres - you can work out why!
Click to expand...
Click to collapse
The issue of position inaccuracy relative to speed won't give a major difference to position - the software maybe responsible for the apparent degradation though.
jthspace said:
Also GPS signals are "secondary" and can be turned off at any time in the event of a military requirement - which is why you can use the signals free of charge.
Click to expand...
Click to collapse
As I mentioned before the US reserve the right to turn on the Selective availability (positional accuracy degradation), if they turn it off their own planes and other civ/ mil products would be useless - Mike
mikealder said:
Where did you get this gem of knowledge from?
Click to expand...
Click to collapse
When I worked on the original GPS launches a while back
Jeff
Static Navigation in Artemis
In Artemis is a Sirf-III-Chipset. One of the "features" of this chipset is a Parameter called "Static navigation".
This gives a more or less "static" position if the device is moving rather slow, like a pedestrian does.
Useful for car navigation because your car is not "dancing in front of the traffic light".
But it gives a more or less not accurate position when standing or moving rather slow. You need to move with 5 Km/h at least.
No tool for switching off "Static Navigation" in Artemis seems to be working.
BBC jamming the gps signal..?
Selective Availability:
"SA works, for the most part, by intentionally dithering the clocks in the 24 satellites that make up the GPS system. The clocks are steered by an algorithm, known to the control station and military receivers and transmitted in encrypted code over the satellite signals."
http://www.exn.ca/FlightDeck/News/story.cfm?ID=20000502-53
The BBC does what??? I don't believe that for a moment!
The GPS signal I get on my Orbit and previously on my Fortuna Clipon has been extremely accurate, using different software Tomtom 5 & 6, pocket streets and Vito all have been down to a couple of meters at most.
I have also used in the US, Cyprus and Spain all with the same accurate results.
Yes the US can turn off civilian GPS if they wish, which is why the EU is building Galileo.
duh... SA has been switch off 7 years ago!
interesting to see people still talking about SA, it has been switch off since year 2000!
http://www.ngs.noaa.gov/FGCS/info/sans_SA/
Related
What is the best GPS for Universal / XDA EXEC / Jasjar ?
Best deal ?
Thanks.
Fantastic Holux GPSlim236
I made the jump to a new GPS mouse, as I was tired of waiting up to 10 mins for acquiring a signal. With this new one I can have it in my pocket and be in a restaurant and still get a signal....it's just amazing. The Holux GPSlim236 Wireless GPS Receiver has a SiRF-Star-III high sensitivity chipset built-in, which makes it work so well. I have yet to experience signal acquisition taking longer than 60 seconds. Usually it's around 10 to 15 secs.
Works flawlessly with my MDA Pro (QTEK 9000 software) and Navigon 5.
Specification:
‧Tracks up to 20 satellites
‧Receiver: L1, C/A code
‧Update rate: 1 HZ
‧Antenna Type: Built in Patch Antenna
‧Minimum signal tracked: -159dBm
‧Dimension: 46.3 × 67 × 19 mm
‧Weight : < 56g
‧On/Off switch : Slide Switcher
‧Operation Temperature: -10 ℃ to + 60 ℃
‧Store Temperature: -20 ℃ to + 85 ℃
‧Operation Humidity:5% to 95% No condensing
Position Accuracy
◆ Non DGPS (Differential GPS)：
‧Position : 5 - 25 m CEP without SA
‧Velocity : 0.1m / sec
‧Time : 1 μsec sync GPS time
Acquisition Time
‧Reacquisition 0.1 sec. averaged
‧Hot Start 8 sec. averaged
‧Warm Start 38 sec. averaged
‧Cold Start 42 sec. averaged
Protocol & Interface
◆ Compatible with Bluetooth devices with Serial Port Profile (SPP)
‧Bluetooth™ version 1.1 compliant
‧Bluetooth™ Class 2 operation (up to 10 meter range)
‧Frequency : 2.400 to 2.480 GHz
‧Modulation: FHSS / GFSK
‧RF channels: 79
◆NMEA Protocol Output : V 2.2 (optional V3.0)
Baud Rate : 38400 bps
Data Bit : 8
Parity : N
Stop Bit : 1
Format:GGA, GSA, GSV, RMC, VTG
Optional : GGL, SiRF Binary
Dynamic Conditions
‧Altitude : 18,000 m ( 60,000 feet ) max
‧Velocity : 515 m/sec ( 700 knots ) max
‧Acceleration : 4G
‧Jerk : 20 m/sec, max
LED Function
Bluetooth , Navigation Update and Battery / changer status Indication
Hi LinuxGeek,
I recently bought a 'inter-active information' BT GPS off eBay and it works a treat with both my M5000 and Symbian 60 mobile. In reality all GPS are much the same. You only need a 12 channel receiver for SatNav etc as only 3 sats are needed for 2D nav and 4 sats for 3D nav but 8 sats will give you a good accurate fix so don't be tempted to get a 32 channel receiver. I've been recommended to get a GPS receiver with RFMD or SRIF III chipsets due to the cold & warm aquisition times.
Hope this helps...
Gavin.
That is incorrect. They are not 'all the same' although most SSIII receivers offer sim ilar excellent performance.
If at all possible, choose a SirFStarIII (SSIII) receiver.
I have a very commun GPS named, socket BT GPS, I bougth in Expansys (Spain) almost a year ago. The price, 113,00 €. It is the first global standard for short-range wireless communication. Bluetooth also provides low power, standardized connections between a wide range of consumer, enterprise, and industrial devices. The Socket GPS receiver will track up to 16 satellites and provide position accuracy down to 2.5 meters and with the removable, rechargeable battery provides up to 9 hours of continuous use.
This is the link: http://www.socketcom.com/product/GP0820-521.asp
The best is Garmin GPS10. Very tiny, magnetic support inside and woks fabulous, till 5 meters in deep water and is the only one that works inside a airplane, because measures velocity till 1280 Km/h. The others when the plane reachs 400-500 Km/h stop sync....It´s not cheap, but is the best...
gazela00 said:
The best is Garmin GPS10. Very tiny, magnetic support inside and woks fabulous, till 5 meters in deep water and is the only one that works inside a airplane, because measures velocity till 1280 Km/h. The others when the plane reachs 400-500 Km/h stop sync....It´s not cheap, but is the best...
Click to expand...
Click to collapse
They 'ALL' work in aeroplanes! Don't make claims about things that you know nowt about!
gazela00 said:
The best is Garmin GPS10. Very tiny, magnetic support inside and woks fabulous, till 5 meters in deep water and is the only one that works inside a airplane, because measures velocity till 1280 Km/h. The others when the plane reachs 400-500 Km/h stop sync....It´s not cheap, but is the best...
Click to expand...
Click to collapse
Ehhh......where on earth do you get the deep water info from? Garmin states: "submersible in one meter of water for up to 30 mins". They also mention "Waterproof — so it can be mounted outside the car for a clear view of the sky". I find the Holux quite amazing, it even keeps a signal captured when I put it in the stowaway area located behind the handbrake, in-between the two front seats! No outside mounting required here ;-)
griffog said:
gazela00 said:
The best is Garmin GPS10. Very tiny, magnetic support inside and woks fabulous, till 5 meters in deep water and is the only one that works inside a airplane, because measures velocity till 1280 Km/h. The others when the plane reachs 400-500 Km/h stop sync....It´s not cheap, but is the best...
Click to expand...
Click to collapse
They 'ALL' work in aeroplanes! Don't make claims about things that you know nowt about!
Click to expand...
Click to collapse
Yes, they all work in aeroplanes....near a window...till 400-500 km/h... But at 900-100Km/h in a comercial airplane how many work? Have you tried? or is just theory? I´ve tried MANY "cheap" gps receivers (ex. Holux 230...) and work till 400-500Km/ my friend... Read the complete specifications and give a try...it´s the best way to achieve acknolege...
It's the same underwater. I use My garmin GPS10 till 25 meters in deep water without capsule... I´ve logs from my underwater computer...So, give it a try
gazela00 said:
Yes, they all work in aeroplanes....near a window...till 400-500 km/h... But at 900-100Km/h in a comercial airplane how many work? Have you tried? or is just theory?
Click to expand...
Click to collapse
Yes I have tried! All consumer GPS are limited to 1000Kts and 60,000ft altitude. I don't know of any commercial aircraft that fly above those limits!
It's the same underwater. I use My garmin GPS10 till 25 meters in deep water without capsule... I´ve logs from my underwater computer...So, give it a try
Click to expand...
Click to collapse
I also find that claim impossible to believe. The high frequency signals will not propagate through a few mm's of water let alone 25m! Are you using a surface antenna?
fslunatic:
I bought the same GPS device, but my Exec is not able to identify it.
I would appreciate it if you could you tell me if you made any changes to the registry and which COM port are you using (in fact it would be execellent if you could list all of the setup details); Or could you please reffer me to the relevant forum pages.
Thanks
gazela00 said:
griffog said:
gazela00 said:
The best is Garmin GPS10. Very tiny, magnetic support inside and woks fabulous, till 5 meters in deep water and is the only one that works inside a airplane, because measures velocity till 1280 Km/h. The others when the plane reachs 400-500 Km/h stop sync....It´s not cheap, but is the best...
Click to expand...
Click to collapse
They 'ALL' work in aeroplanes! Don't make claims about things that you know nowt about!
Click to expand...
Click to collapse
Yes, they all work in aeroplanes....near a window...till 400-500 km/h... But at 900-100Km/h in a comercial airplane how many work? Have you tried? or is just theory? I´ve tried MANY "cheap" gps receivers (ex. Holux 230...) and work till 400-500Km/ my friend... Read the complete specifications and give a try...it´s the best way to achieve acknolege...
It's the same underwater. I use My garmin GPS10 till 25 meters in deep water without capsule... I´ve logs from my underwater computer...So, give it a try
Click to expand...
Click to collapse
Did you read the posts before yours?
You have the full specs for hollux gpslim 236 where it states clearly 700 knots do you know how many 700 knots is? You're right it's 1300 km/h
Hi techDot,
I didn't do anything unusual really. I switched on the GPS device and then activated Bluetooth on my MDA-Pro. I then let the MDA-Proi look for Bluetooth devices. It found the GPS and then I set up a standard partnership....it took less than 2 mins.
I believe I am using COM0. What navigation software are you using? What particular steps are you going through?
I didn't touch the registry or anything....all very straight forward. Hope we can help you and get it working.
techDot said:
fslunatic:
I bought the same GPS device, but my Exec is not able to identify it.
I would appreciate it if you could you tell me if you made any changes to the registry and which COM port are you using (in fact it would be execellent if you could list all of the setup details); Or could you please reffer me to the relevant forum pages.
Thanks
Click to expand...
Click to collapse
<<Did you read the posts before yours?
You have the full specs for hollux gpslim 236 where it states clearly 700 knots do you know how many 700 knots is? You're right it's 1300 km/h>>
LOL! Hehe......
Assuming i were to by the one suggested by fslunatic, what would be the best navigation software? i don't know a great deal about this subject. I have been looking at the tomtom software but, a) can't find somewhere that just sells the software / maps and b) find anywhere that says it is compatible with the HTC universal (XDA Exec in my case) windows mobile 5 software.
Anyone shed any light?
P.S. How much did you pay for yours fslunatic?
I use an O2 Exec with TomTom 5 and it works superbly.
Excellent did you manage to just by the software from somewhere or did you buy the 'tomtom kit' they mention on the website that includes the GPS unit and all? i'd rather by the GPS unit mentioned by fslunatic and buy tomtom software separately, assuming it's all compatible of course (anyone know?).
gratz: Try looking here: http://www.tomtom.com/products/product.php?ID=109&Language=1
EDIT: Doh! They don't sell it on their website! Try here: http://www.pdamods.com/proddetail.asp?prod=X1TTSOFT for UK on an SD card or here: http://www.pdamods.com/proddetail.asp?prod=X2TTSOFT for the rest of Europe.
£120, just for the software? That's ridiculous :shock:
ncruz said:
gazela00 said:
griffog said:
gazela00 said:
The best is Garmin GPS10. Very tiny, magnetic support inside and woks fabulous, till 5 meters in deep water and is the only one that works inside a airplane, because measures velocity till 1280 Km/h. The others when the plane reachs 400-500 Km/h stop sync....It´s not cheap, but is the best...
Click to expand...
Click to collapse
They 'ALL' work in aeroplanes! Don't make claims about things that you know nowt about!
Click to expand...
Click to collapse
Yes, they all work in aeroplanes....near a window...till 400-500 km/h... But at 900-100Km/h in a comercial airplane how many work? Have you tried? or is just theory? I´ve tried MANY "cheap" gps receivers (ex. Holux 230...) and work till 400-500Km/ my friend... Read the complete specifications and give a try...it´s the best way to achieve acknolege...
It's the same underwater. I use My garmin GPS10 till 25 meters in deep water without capsule... I´ve logs from my underwater computer...So, give it a try
Click to expand...
Click to collapse
Did you read the posts before yours?
You have the full specs for hollux gpslim 236 where it states clearly 700 knots do you know how many 700 knots is? You're right it's 1300 km/h
Click to expand...
Click to collapse
Do you guys all have your own planes? It's just that I've never had the need for Sat Nav on a commercial plane before. I find they rarely take a wrong turn ("At the next fluffy cloud, turn left") and no matter how many times I enter my post code they always take me to a flippin airport! :wink: :lol:
On a serious note, is there a plug and play packege that needs no clever programming or other jiggery-pokery to get working?
Thanks,
Dunc
hey can anyone recomend a cheap GPS bluetooth unit for use with a Magician and Tomtom.
cheap and nasty will do,
Look on ebay, there are loads to choose from
Yes check eBay but try to get the TomTom one as it works out of the box. TomTom can be a real pain to get working with other receivers.
ta yeah i was watchin a few on ebay,
was hopefull someone might have suggested a place to get them from cheap or something lmao
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=230047740000
ive just got one of these. if you get one go to the web site on the instructions. there is a little gps test program which when you run will find which com port the gps is on (close the prog fully).
When i tried to get it to work on tomtom i couldnt. so after a search on the tomtom site they say to set tomtom gps settings as 'another nmea wired gps with 4800 speed' use the com port found in the test prog for the gps
Works fine so far. only had it 5 days.
thanks yeah i got one last nite, similar to that (16 channels and such)
yep already seen some threads about special patches and stuff.
cant wait to try the Yoda voice that i picked up for tom tom.
"Turn left you must"
i just bought the qstars btq815 from ebay32 channel with solar panel.....got tom tom 6 on the spvm3100, only had phone a week so am real novice but i managed to get it up and running fairly easily only made a short journey to test but all seemed ok
32 Channel? Why?
There's only 24 GPS Satellites and only 12 can be visible at any one time.
Do you know if the receiver will also work with Gallileo when that comes on line? Then 32 channels might make sense....
need bluetooth GPS reciever
can anyone help to find a bluetooth gps reciever that works with XDA ATOM
thank you
well ive been playing with the qstarz bt-q800 for 3 days solid... gps on the window ledge in the house, xda 2i has run flat so many times that it on the psu now im still waiting for the gps to go flat... im really impressed with the battery usage on the gps.
I took the pair of them out for a walk round town yesterday. had tomtom running, walked down to the bus, go on into town. realised i was killing the battery on the xda so left tomtom running, turned the xda off with the pwr button on top. the gps went into standby mode. 30mins later turned on the xda, tomtom reported no gps, the gps then woke up within 20 seconds, and with in a further 40seconds had found my new location. quite impressed.
the bt-q800 also has an external aerial connector too. might think about getting one to fit on the landrover. GPS always has a bit of a problem in it because the front window is almost vertical so the roof covers the dash.
TheBrit said:
32 Channel? Why?
There's only 24 GPS Satellites and only 12 can be visible at any one time.
Do you know if the receiver will also work with Gallileo when that comes on line? Then 32 channels might make sense....
Click to expand...
Click to collapse
yeah tomtom standards are about 20, i got a 16.
even the navman will only have 3 active at any one time.
well i finaly got the qstarz to go flat... it was connected and tracking for 18hrs solid on top of being switched on for 4 days and doing several hours a day of tracking in that time,
. Im impressed just at the battery..
Only 3? - that's not good for accuracy and calculating your heading etc - you should connect to 4 at least to get the best accuracy.
yay 2 more days and i git it,
got the phone ready to go,
TOMTOM with aussie maps
including all POI's (speed cameras etc)
6 celeb voices (go yoda and john Cleese)
According to Google Maps 4.0 my gps is never accurate within more than 20-30 meters. usually when im driving i am on the wrong side of the road or in a ditch somewhere.
on my girlfriend's droid her accuracy is about 1-3 meters at best and is never any greater than 10 m.
same goes for my friends blackberry storm...about 5 meters.
So i am wondering if you guys are having better accuracy with the phone.
is it a hardware or software issue? and any idea on how to make this better??
Thankss
No my gps is very accurate. It could be due to the radio version you are using. You didn't mention witch version you use, but try some different radio's and see if you get a better gps signal.
HD2 GPS is a joke!
My HD2 GPS is very, very lousy - when I record my path (on feet) with e.g. RunGps or NaviCompiter, I am getting an ugly zig-zag line with position errors of 20-40 meters! (In city or in open field - does not matter). Unbelievable P.o.S! My radio is now 2.09.51, was 2.07.51 - same s..t.
My old Samsung i780 draws very smooth line with errors within 1 meter, seriously.
HD2 GPS works with Tomtom though, sometimes turning map around when pausing at a crosing or recalculating, but generally OK.
Unless one is seriously geocacheing or needs absolute precision, I regard 20 meters to be fairly decent, 10m to be fantastic when using google maps. But then again I use GPS and map software as a guide not an absolute... I've always taken the stand that map software doesn't know everything about a location, nor does it know the best way to get there.
I do agree the gps accuracy is dependent on the radio though and some are better than others at getting a good signal
My TP2 accuracy is very good. As good as my Garmin handheld GPS I use for geocaching. I went for a jog the day before yesterday, and tracked my progress with SportyPal (http://sportypal.com) and when mapping my route on Google Maps my position was good to within 3 meters (and usually significantly better). I ran up and down some bleachers and it showed my proper position right up and down the isles.
I've also used it for geocaching, and it usually brings me to within spitting distance of the cache.
The reception is also better than any other GPS I've used. It will usually pick up my position in my office, which is half way underground with an entire second story above me.
So is the GPS receiver on the Touch Pro 2/Tilt 2 better than what is used on the Touch Pro/Fuze? I assumed it was probably the same since most everything else (hardware) is the same. Although you would think that HTC would have fixed it after all of the complaints with the Fuze.
I'm thinking of upgrading from the Fuze, but so far the only advantage is the screen. If the GPS has been improved, that will make a difference.
Hello, for about 2 weeks my gps has been working and has been taking a little bit longer than normal to lock. but thats not the problem.
the problem is when it does lock the position will be off by 1/4th mi to about 3 miles and its usually connected to 8 or 9 sats and says position within 10-20 meters
im not very good with the metric system but im pretty sure that 20 meters does not equal 3 miles and the little blue circle is not that big
and keep in mind this is outside clear weather and no big buildings around
i was wondering because i heard that there will be no more funding for the gps sats and would slowly start failing because they wont get the upgrades they need and also i heard about a month ago that there will be some big solar flares that could mess up the sats
another thing is using gps test. is showing that the sats that are connected are lower signal than they usually are. mostly in the yellow. but i see no reason for that...
this only started happening for about a week or 2.
anyone else having this problem? can a radio update fix this? if so which would be the best one for t mobile usa (link if you can)
Radio ver: 4.49.25.57
thanks for your support,
Darian
turn off your agps, as it uses cell tower signals to locate you, and can over ride the gps signal you are getting. the agps is triangulating your position and is generally only accurate to 300 to 1300 meters.
i thought agps was only used to get a faster lock on the sats
Hi all,
I got an used Galaxy Nexus (unrooted, stock everything) a few months ago, with plans to use it as an outdoor gps for hiking, biking and maybe paragliding (so I wanted a barometer in it).
I live in Florida (that as you may know is all very flat... maximum altitude is about 100 meters above sea level), and I was very pleased with it (the phone, not the flatness of Florida!) until I took a trip to Colombia in December. There, I had two "bad" experiences with the Google Nexus GPS:
- I took a hike that brought me to an altitude of about 4800 m. Around an altitude of 4000 m (the last recorded point is 3992 m), the GPS lost fix and would not get it again, although GPS Status would show plenty of satellites (9 or 10) all green (that according to GPS Status help means "satellite is used while determining the location"). After rebooting and starting GPS status (but I've tried other programs too, in case you wonder) the GPS will display that it had a fix for just a second or less (coordinates would appear in the GPS Status screen, and one single point woudl be recorded, with aan altitude of 4400 m although I was probably at 4800 m) and then loose it again, never to be reacquired.
- On my flight back, I tried to record the flight. I got a fix while just before takeoff and maintained it until... 3995 m! Then, fix was lost, again never to be reacquired again (actually, I did try again when the plane was at about 1000 m, and I was able to get a fix and record the landing with no problems)
Now, for someone that likes mountaineering, 4000m is a pretty low limit! I really don't care about recording commercial flights, it's just for fun, but a GPS that stops working above 4000m while you are hiking in the mountains could mean trouble.
I've searched around the internet (including this post on XDA), but I haven't find anyone complaining about this issue at this level. Many people complain/discuss about ITAR limits, but those are much higher than what I experienced.
So, I'm wondering if is it a problem with my unit, a problem with the Galaxy Nexus, or just a coincidence? Anyone had a similar experience?
BTW, I had an T-Mobile G-2 (HTC) that worked very well both for flights and mountaineering.
Giacomo
That would explain why the gnex won't get a fix while at cruising altitude..
Beamed from my iPad Mini
Hi,
I had the same issue with my galaxy SII i9100g.
I had a mountain climbing with a summit of 4500 meters, in the beginning we really didn't need gps tracking because there was signs showing the track in the mountain. I checked the device and everything was fine the first day the signals were ok and I had my position on the phone. but in the second day when it got foggy we were in trouble as I wanted to know our altitude. and gps signals wouldn't fix. I had ten or so satellites in view but the message said "waiting for gps fix" and it didn't fix at all. I also restarted the device but it wouldn't help.
in another trip on a plane I started recording the route with gps, and I noticed last recorded point was at an altitude of 3985 meters. and when the plane reached higher altitudes i lost the fix.
I think they should give us warning about using such devices in hiking trips. it could make real trouble for me.
It might be a problem specific to the GPS receiver used in Google Nexus. Giving that I've noticed GPS late fix problems with my Nexus (compared to a Galaxy S3), I'll try checking out the internet myself too.
Have a good day!
I find it remarkable that high-tech companies such as Google or Samsung keep managing to put in design flaws or outright defects that can easily kill people. The one described here is an outstanding example. If using the GPS with good success while hiking, nobody in his right mind would ever get the idea that the GPS would suddenly stop working above a certain altitude. So some programmer has intentionally put in a deadly trap (unless you want to believe that a command like "if (altitude >= 4000) return null;" can be written inadvertently). This is sabotage of a very dangerous kind.
Another less obvious example is the design of the power button, which can easily be activated inadvertently. If somebody needs the phone to navigate and survive in the wilderness and decides to power the device down until the next critical point to keep the battery charged for a long time, the device can easily lose all power just because of an inadvertent power push in a bag or pocket. The obvious solution here is a recessed power button or, in a cinch, that the device automatically powers down again if no user action happens within reasonable time after power-up.
The rule is generally that the design is stupid, the defect is obvious, at least one solution is also obvious, and even when the flaw or defect is brought to their attention, it is not fixed. Dangerous idiots at work. Perhaps they reckon if somebody actually dies, it will be impossible to prove that the smartphone design defect was a contributing factor. It is the responsibility level of a school child.
I am sure there are more examples for this behavior.
I am not saying that people should hang their lives on their smartphones. If the smartphone is the only thing that keeps you alive, then you have already made a planning mistake. But we all know that one can get into situations inadvertently where several things go wrong in unlikely ways. In such a case you can get into a situation where your life depends on the GPS in your smartphone, and then either of the defects described above could conceivably seal your death.
My screenshot from the plain
Sent from my Nexus 5 using XDA Free mobile app
giacomociani said:
Hi all,
I got an used Galaxy Nexus (unrooted, stock everything) a few months ago, with plans to use it as an outdoor gps for hiking, biking and maybe paragliding (so I wanted a barometer in it).
I live in Florida (that as you may know is all very flat... maximum altitude is about 100 meters above sea level), and I was very pleased with it (the phone, not the flatness of Florida!) until I took a trip to Colombia in December. There, I had two "bad" experiences with the Google Nexus GPS:
- I took a hike that brought me to an altitude of about 4800 m. Around an altitude of 4000 m (the last recorded point is 3992 m), the GPS lost fix and would not get it again, although GPS Status would show plenty of satellites (9 or 10) all green (that according to GPS Status help means "satellite is used while determining the location"). After rebooting and starting GPS status (but I've tried other programs too, in case you wonder) the GPS will display that it had a fix for just a second or less (coordinates would appear in the GPS Status screen, and one single point woudl be recorded, with aan altitude of 4400 m although I was probably at 4800 m) and then loose it again, never to be reacquired.
- On my flight back, I tried to record the flight. I got a fix while just before takeoff and maintained it until... 3995 m! Then, fix was lost, again never to be reacquired again (actually, I did try again when the plane was at about 1000 m, and I was able to get a fix and record the landing with no problems)
Now, for someone that likes mountaineering, 4000m is a pretty low limit! I really don't care about recording commercial flights, it's just for fun, but a GPS that stops working above 4000m while you are hiking in the mountains could mean trouble.
I've searched around the internet (including this post on XDA), but I haven't find anyone complaining about this issue at this level. Many people complain/discuss about ITAR limits, but those are much higher than what I experienced.
So, I'm wondering if is it a problem with my unit, a problem with the Galaxy Nexus, or just a coincidence? Anyone had a similar experience?
BTW, I had an T-Mobile G-2 (HTC) that worked very well both for flights and mountaineering.
Giacomo
Click to expand...
Click to collapse
Which model is you GN?
Sent from my Galaxy Nexus
Jar3112 said:
Which model is you GN?
Sent from my Galaxy Nexus
Click to expand...
Click to collapse
It's a Samsung Galaxy Nexus I9250.
I should also mentioned that in the meanwhile I have found on various forums a (very limited) number of users reporting the same problem with the same phone, but no one reporting that it works for him. So I start to be confident that it is a problem of this particular model...