Rex, by the strictest interpretation any GPS enabled device is not compliant, and yes that is how I read it. But, I'm just another competitor just like you, I have no authority in how the rules are interpreted.

As sloansailing pointed out, if the three words "long distance courses" were struck the issue could be handled at the event level. I want to remind everyone again, the USF18 class voted to drop the prescriptions which dropped the ability to use the Speedpuck so... there are more than a few that are okay with the no GPS rule.

C.5.1 FOR USE
(a) MANDATORY
(1) One righting line, minimum 4 metres long and 10 mm minimum
diameter.
(2) One magnetic steering compass.
(b) OPTIONAL
(1) Magnetic compasses.
(2) Mechanical timing devices. Mechanical wind indicators.
(3) Electronic devices that provide timing, heading, and heading
memory but which do not transmit or receive data.
(4) When required by the Notice of Race for long distance courses,
organisers may require further equipment, such as VHF, mobile
phone, GPS or tracking devices, Emergency Positioning Indicating
radio beacons (EPIRB) devices, knife, mirror, whistle, flares,
flashlights, first aid set.