If you sail on a small boat without electronics, you may appreciate having some basic speed and heading data to help dial in your tactics and sail trim. Velociteks new Speedpuck is a handheld GPS receiver that displays your course and speed over ground and allows you to recordand later downloadthe data so you can compare your performance against other boats. This clever device also displays header and lift data, has max-speed recall, and can be operated with just one button. The unit updates its speed and heading information twice per second, and is waterproof to six feet. The back of the unit unscrews to reveal a AAA-battery housing and a USB port for downloading data. $339.