Babs figures anything this guy wants so badly is something she should probably snatch out from under his nose. She accesses the Hickory's registration information. Bingo; it has GPS installed, for the insurance kickback.

A couple minutes of judicious hacking later, the boat's coordinates have somehow been switched with a Coastguard buoy.

That gives her plenty of time to look into the actual boat, and figure out why it has a second emitter in addition to the registered GPS