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?

  • Were you in the same location for #1 and #2? – geffchang Sep 25 '13 at 9:37
  • Yes, same location. – Kozuch Sep 25 '13 at 12:33
  • 1
    According to the USCG (page 55), GPS almanac data is valid for 180 days. – Compro01 Sep 25 '13 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 '13 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 '13 at 8:06

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