I'm now using a GPS II with Both a Mercury system and a Royal SRS system to provide iGyro speed compensation for the internal Gyro (works great!). I have also tried using a 2nd GPS II with a PBR-9D to provide Speed & Height data to the widgets on a CORE Tx (also works great!). My question is this: Do I have use 2 GPS II's to provide this type of functionality (given that the PBR GPS II plugs into a "Y" attached to the P2Bus on the Rx and the "Tele" port on the PowerBox system, and the GPS II for speed compensation plugs into the "GPS" port on the system that I'm using). OR... Can I achieve the same functionality using only 1 GPS II? If so, is a "Y" required, and how is the wiring laid out?