From OpenEZX

Using the A780 AGPS Module

The aGPS module of the A780 is connected to BP, and AP receive the datas through the mux line (mux14), in a binary form using a Motorola proprietary protocol.

Antonio Ospite developed "gpsmux" to simplify all this, and retrieve the longitude and latitude in a more readable format.

The A780 geolocalisation only works if you have started the phone with BP in normal mode, see Dual boot.

Get it there : http://people.openezx.org/ao2/gps/