Well.. If you don't wire your BT GPS receiver to a powersupply...
1) you'll have to nudge it each time you start the computer because most BT GPS units auto shutdown after 10min or so of inactivity.
2) So now it will have to be on the front dash w/in reach instead of tucked away as you might have previously planned.
My advise: go serial (BR355).. zero issues w/ hibernation, no need for drivers.