Battery seems to be fine:
12.4V Cold - Sitting for 2 weeks
9.6V Cranking - Or real close to that, it's a bit hard to get it exactly because the engine fires up immediately
Could it be that the GPS on the same circuit as the lights which all switch OFF when cranking the engine? I don't have a schematic.
There you go, 9.6 v cranking is too low. No, power to the GPS does not shut off when cranking.
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