The GPS-90D is a combination DGPS and track plotter, with the advantage of a full keypad for easy selection of all functions. Similarly priced competitor models require you to punch the arrow keys many times just to input a single waypoint. Not so with the GPS-90D. Its keypad is a real convenience for those who'd rather be trolling than scrolling. Capable of holding 2,000 plotting points and 400 nameable waypoints, the GPS-90D offers a host of features, including a built-in track plotter, graphic navigation pages and a differential beacon receiver that's accurate to within ten feet. SI-TEX, St. Petersburg, FL; (727) 576-5734.