Garmin GPS, GPS 17 HVS, RECEIVER, WAAS Receiver, WAAS enabled, 12 parallel channel GPS GPS accuracy, &lt;15 meters, 95% typical DGPS, WAAS accuracy, &lt;3 meters, 95% typical Physical suze, 3.58 inch (91mm) diameter, 4.25 in (108 mm) height Cable, foil-shielded 8 conductor, 28 AWG