There is a lot of information to deal with when looking at Autocom system's much less when you start trying to connect peripheral devices. Below are links that will provide information on technologies and 3rd party products.

Informational Links
Understanding 2-Way Radios
Understanding Bluetooth

3rd Party Product Links
Garmin (GPS)
TomTom (GPS)
Icom (Two-Way Radios)
Kenwood (Two-Way Radios)
Adaptive (Radar)
Valentine One (Radar)
Beltronics (Radar)
Escort (Radar)
XM (Satellite Radio)
Sirius (Satellite Radio)

Miscellaneous Links
Autocom (U.K.)