Coordinates GPS are sometimes not accurate

Hello

I made a Java application a while back who gets a GPS coordinate every 15 minutes since the Blackberry and sends it to a webserver to display on a map.

My request (map on the web server and a native app on Blackberry) works very well.  However, from time to time, I get a GPS coordinate which is far away (sometimes even in the middle of the Atlantic ocean).

It seems very random.

I've seen this problem on many different models (to name a few): Curve 8330, Curve 8530, Storm 9530, and even the Torch 9800.

It is very annoying! And not very professional (such as users laughing when the point is in the water).

I saw this post, which reports a similar problem:

http://supportforums.BlackBerry.com/T5/Java-development/GPS-location-data-is-sometimes-not-accurate/...

I tried the suggestion of turning 'Location helping' to 'Off ':

http://docs.BlackBerry.com/en/smartphone_users/deliverables/3045/Turn_off_location_aiding_400936_11...

It seems to help a bit, but the problem still sometimes.  It is particularly terrible with a Curve 8530 (in the Mississauga area) where I get weird GPS coordinates every day (in the middle of the ocean or in the North).

I wanted to do an audit of the points in my code when the card to receive, but it is not an easy task. I compare the new point to the last... and check the distance (in km) between these two points and to reject the last of them if the distance between the two is impossible.  I did that... but I ran into problems when, for example, the Blackberry has been down (or cover, or gps unavailable or dead battery) for several hours (I was then rejecting good GPS coordinates).

Is there something I could do to avoid this problem?

Someone has encountered this before?

Thanks for your help!

I do actually all of this processing on the device: it is useless to send data to throw!

I encourage you to take the readings with less or 4 satellites.  And as mentioned, if you have 6 satellites or more, then I would be very very sure that the value is OK and would even not worth checking with the previous.

If you are only concerned about the values with 5 satellites.  According to my experience on the BlackBerry, they are sometimes good and sometimes not.  Distance and height appear to be good checks, when times are close enough.  When they are not, then I would actually say you should wait until you get a value with 6 satellite offices before you start recording.  If you missed 10 hours, lack even a minute won't be disturbing.

That said, your validity check server-side seems similar to mine.

Note that if you use a location, my experience it creates actually a place and then updates, so you should clone the location you get, otherwise he will geet was updated the next value that is passed to you.  You probably already have spotted that.

For other phones, look at these:

http://StackOverflow.com/questions/2872307/iPhone-GPS-logging-inaccurate

http://groups.Google.com/group/Android-developers/browse_thread/thread/685fee810e18b7f9

Tags: BlackBerry Developers

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