It is our best selling speed control system because it is so versatile and easy to use! The GPS Star Gazer is designed for wakeboarding, surfing, course skiing and is even perfect for tubing. From 8 mph to 40 mph, let PerfectPass take the stress out of driving with amazing GPS accuracy. Ideal for most ski, wakeboard, stern drive and select Yamaha jet boats. Each system comes complete to fit your boat/engine and includes a full size in-dash Display Gauge.