Methods and apparatus for facilitating the determination of Global
Positioning System (GPS) location information for a mobile station
without disrupting communications of a voice call (e.g. a 911 emergency
call). In one illustrative example, the mobile station causes GPS
navigational-type data to be regularly or periodically received and
stored in memory prior to the voice call. At some point in time, the
mobile station receives a voice call request to initiate the voice call.
In response, the mobile station derives GPS assistance data based on the
GPS navigational-type data. The mobile station then causes a GPS fix to
be performed using the GPS assistance data, to thereby obtain GPS
measurement data. Thereafter, the mobile station causes the voice call to
be established and maintained through the wireless network. The GPS
measurement data is transmitted to a location server for calculating the
location of the mobile station.