I think there are some problems with GPS on the newer Blackberry models and the latest Google Maps. I've only got a 'cell tower' location pulled in, but my Tour always says that GPS location is unavailable. Always.
I've opened every permission possible for Google Maps and downloaded Maps 3 times. Never have gotten a GPS location sync yet on my new BB Tour.
Never had a problem on my old Curve - while moving at 80mph or standing still. Rats!