hmm, are we sure about this. Afaiu agps-ui allows you to tap on the map and send the lat/long to a supl server which will work out the ephemeris data for that location.

It might be possible to calculate Almanac data on-device (though I've not seen any sign of this) and I think this data contains more than a simple geometric projection of the satellite locations knowing a prior position, but I think Ephemeris data would be rather time consuming (and would require outside assistance - to obtain corrections supplied by someone as to the ionosperic conditions and satellite path variances).

Therefore, afaik, to use AGPS you require some sort of connection - this can be in the form of a wifi connection (in which case you tap on the map and the lat/long are used to give you an approximate set of Ephemeris data) or via your mobile phone, which should be able to automatically tell the supl server which base tower it's connected to (which is more accurate than tapping on a map).

Just my thoughts of course,

Cheers,

Simon

P.S. Regarding using SSIDs to work out positions, this is probably the next step - to use GeoClue (in with whatever backend) rather than agps-ui. I hope so anyway