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Old 10-23-2012, 03:56 PM   #6
Talking BlackBerry Encyclopedia
Join Date: Jul 2005
Model: 9800
Carrier: Optus
Posts: 253
Default Re: 9790 - poor GPS performance - is it only me?

Originally Posted by Dubdub View Post
If it has been 7 or more days since you last used GPS, the device needs to download the ephemeris table first so it knows where to look for which satellites.
I never knew that. Any idea how long that should take, and where it downloads it from? Do dedicated GPSs do this, e.g. Garmin with no SIM?
If you have moved a considerable distance from the last use, it also takes a few minutes to locate the satellites and determine your position.
I didn't know that either. If both these things are correct then it sounds like irregular users of the GPS function should plan to use it at least until it gets a fix the day before they need it, and perhaps daily if they're travelling.

My 9800 is usually ok, can even get a fix indoors sometimes, but is occasionally erratic. I don't use it regularly, so this might explain some of its behaviour.
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