Zero Off is a new system to the marketplace, based solely on the input from satellites and the engine management system. It is based completely on the speed across the surface of the water; therefore, there is no requirement for skier weight, crew weight, KX, PX or even any kind of wind adjustment. You simply set the desired speed and go.
The system is coming as an option in the new Correct Craft line, and it's sweet. No more yo-yoing up and down when you start up, and if you can drive the line, then double ups are perfect every time. The system communicates with the satellite 5-times per second, and is accurate to 1/10 mph.
It retails at $1299, but worth every penny if you ride a lot. Check out www.zerogps.com for more info.