The speedpuck uses a gps, i'm pretty sure the rules dont allow it for racing.
The US Fleet created a set of prescriptions for the 2010 NAF18 Championship to allow the device and the fleet voted to keep those prescritions in effect until the 2010 WC vote in December at which time all the prescriptions (for the US) will expire. I supsect the CA fleet did something similar since the CA F18 President was at the USF18 fleet meeting last August.