Power/gnd should be self explanatory but one of the RX wires -> D2 (INT0 --There are 2 interrupt pins on the arduino, D2=INT0 and D3=INT1.) Sorry i haven't addressed the surfband in the docs yet. It will only switch sides when "speedlimit" is valid -- and it resets once speedlimit is no longer valid (this is intentional since there is a physical switch at the helm, i didnt want it to be confusing.)
I havent verified if multiple of those bands have the same transmitting ID - i assume they do - but if it doesnt work let me know and I'll send you some simple testing code to capture the output from your band so update the source until I get a chance to write a capture-code part.
I haven't been able to see this trigger in the serial monitor yet, im waiting on a new GPS arriving Thursday. Everything else seams to be working fine when opting out the speed //. But when i test it moving, i have been having an issue with the GPS. When i resolve that, I will update on the band.