If you use the DIYDrones MediaTek GPS, you're probably aware of the fact that, on each activation, it make take a very long time to get proper satellite lock. The reason is that it always starts from scratch; it is not aware of it approximate geographic location, not of the time.
The reason for this is lack of backup battery. Data is completely erased once you disconnect the main battery.
The GPS module itself has a backup battery input. I added a new Wiki page to the ArduPirates Wiki that shows how to connect an external battery to that input.
http://code.google.com/p/ardupirates...backup_battery (link fixed)
Dror
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