The 4.1-inch display will fit in just about any tight nav station or at the helm. It's easy to read in bright sunlight and features bonded-glass construction that claims zero condensation and excellent viewing in all weather and viewing angles. The simple menu easily lets you page through the data you would like displayed (wind direction, depth, speed, course, GPS, autopilot). The IS40 interfaces with Simrad, B&G, and data from other manufacturers. It measures 4.6 inches in width and height and is .65 inches deep. Designed for 12v DC environments, the IS40 sips power at 50-150 miliamps.