The best thing abt htc sensation is its gps system. With it i can use gps for free without data connection...a-gps is to assist gps locking base on ur network or data connection... However for gps to fully work, i will recommend to use at open area (example: outside the house, no roof or tree above) so that the signal not blocked..As for me..I always use my gps ('locations' which comes with HTC phones)with WiFi/mobile network off...n still 100% works....KUDOS to HTC ....I am really getting addicted to it.
