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with BDS, you can send text back
For that you would need something with much bigger battery and better antenna. Even your phone would struggle with that task https://en.m.wikipedia.org/wiki/Satellite_phone#Integration_into_conventional_mobile_phones
But maybe there could be deluxe version of the watch sold as a kit with two tinfoil hats, one small for the watch and one bigger :-)
fanoush
ccchan
btw, will you guys prefer 1 way GPS instead of China's 2-way BeiDou (The BeiDou Navigation Satellite System (BDS))?
it is told that with GPS, you can only receive signal from the sats, to calculate your location.
with BDS, you can send text back, but with that, if there is spyware, it's worrysome.
the OS espruino is foss i know, but hardware-wise i dont know what we can control.
and i am not sure if BDS provide a read-only framework and is it trust-able.