You just punch it in and monitor away. You're not allowed to transmit obviously, and your radio wouldn't allow it anyway unless you went in and hacked it up. But anyone can listen!
82 fj40, 99 uzj100, 06 gx470
97 DR650, 05 525EXC, 01 XT225, 09 TTR125, 07 TTR90, 07 CRF50