Use your VHF antenna for your CTRX and GPS/VHF-radio with this new Class B VHF-antenna splitter of True Heading. Also on board of the Volvo Ocean Racers 2008-2009. Start using AIS Class B transponders for maximum safety in board. Ideal in combination with WinGPS 4 Voyager. The AIS-extrapolation shows fluent movements of AIS ships on your electronic chart and alarms you for possible collision.