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Going to have to find the data sheet for the AT6558.
Got some stuff mostly in chinese, one link to english datasheet here https://github.com/fanoush/ds-d6/tree/master/espruino/DFU/B5#hardware however the commands were in different one, google for "CASIC Multimode Satellite Navigation ReceiverProtocol specification" , see also this https://gist.github.com/fanoush/505a6f44532e4fdaadef4da5777d7777#file-b5-demo-js-L280 it can enable all three GPS providers (GPS,BDS,GLONAS)
there is also some AGPS sdk stuff on manufacturer's site that seems to work and produce AGPS binary data suitable for this chip
fanoush
I'm in for the crowd funding. Looking forward to getting my hands on one.
I remember you said the GPS was a pain.
Going to have to find the data sheet for the AT6558.