Re: [android-developers] Re: How to get accurate time stamps from Android GPS location.

Each subframe (sent every six seconds) has the *GPS Time*. The GPS/UTC offset is only sent in subframe 4 of page 18 of the almanac data, i.e. once every 12.5 minutes.

Also, a comment on the ZDA message mentioned previously. I had tried that as part of my project R&D and it also returns "best guess UTC", just like RMC. i.e. if the receiver hasn't received the GPS/UTC offset, it doesn't actually report UTC.

On 25 April 2012 19:22, StarTraX <gpsanimator@gmail.com> wrote:

I've been reading up on the GPS signal structure, and it's true that it takes 12 1/2 minutes for the full sequence, but... and this is a big but... the GPS time and GPS/UTC offset are sent with every sub frame, and they come by every six seconds. 

So you can forget about waiting 12 1/2 minutes. before being certain of the time! It's synchronized every 6 seconds. Its all well explained in Wikipedia http://en.wikipedia.org/wiki/GPS_signals

--
Andrew

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