Do remember that from a cold start, whilst a good GPS with a decent antenna with a good view of the sky will get a time and position lock within 40 seconds or so, that time can be 1 or 2 seconds out. It can take 12.5 minutes for the time to be the same as UTC, longer if its a poor GPS, has a poor antenna or is in a poor position.
This 1 or 2 second error might not be important, but it can be if your trying to sync seperate devices to the same second.