0

I have a Samsung Galaxy S3 mini and did two tests, both with cold GPS start (without A-GPS data):

  1. starting GPS receiver 11 hours after last fix - got new fix almost instantly (30 seconds)
  2. starting GPS receiver 23 hours after last fix - could not fix in 10-15 minutes (did not count exactly)

I have to mention the GPS was turned on in Android system between last fix and test and phone was on wifi. My question is - how long do GPS almanac data last for a quite quick (say under 3 minutes) cold start?

5
  • Were you in the same location for #1 and #2?
    – geffchang
    Sep 25, 2013 at 9:37
  • Yes, same location.
    – Kozuch
    Sep 25, 2013 at 12:33
  • 1
    According to the USCG (page 55), GPS almanac data is valid for 180 days.
    – Compro01
    Sep 25, 2013 at 18:22
  • Apps like GPS Status and Toolbox will let you know the current age of your device's GPS almanac and force a download of a fresh almanac if you're worried about that being the problem.
    – GAThrawn
    Sep 27, 2013 at 12:34
  • Yes I use GPS Status app... actually forcing to download the almanac helped in the case #2 I think.
    – Kozuch
    Sep 30, 2013 at 8:06

0

You must log in to answer this question.

Browse other questions tagged .