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Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
@pelrun
It's volatile data, definitely. Standalone GPS units invariably have a ram backup battery to keep the most recent almanac/ephemeris/location/time data to allow a warm boot, but I'd expect the watch to be designed to keep the gps warm off the main battery even when disabled (it's microamps or less) or else the software needs to cache the AGPS data and feed it back in when necessary.
The other part of improving the TTFF is having an approximate location/time to start from, which obviously isn't part of the ephemeris data. The AGPS.zip file has code that builds an AID-INI message that has that in it, so I think the full solution is going to need both parts.