Confused over getting GPS location in Blackberry

开发者_如何转开发I am really confused over getting GPS location of user. do i have to implement separate logic for GSM and CDMA devices??...besides there are so many modes for getting GPS location(cellsite , stand alone , cell assisted etc). really confused over which criteria to set..and also some networks refuse some modes(e.g. cellsite).

what i really know that autonomous mode works for all. but that cant be used inside buildings , over near tall buildings...so that doesn't make any sense.