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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.
@HughB
I tested the B2 battery from 100% and totally discharged it in 6 hours with the GPS on.
For a 3hr walk I would not risk going out with 80% battery and expect the GPS to work for more than 1 hour or so.
Before the B2 had support in the AGPS app, time to first fix would take 12 minutes BUT only if only stationary out in the open. Now I use the AGPS everytime I want to use the GPS and it gets a fix within 1 minute. I log onto the AppLoader on my phone and do it before I leave the car.