The rugged GPS 17x NMEA 2000 receiver/antenna offers high sensitivity reception and pinpoint GPS accuracy to the Garmin family of marine instruments, autopilots and multifunction displays. Delivers Precise Location Data: This 12-channel receiver continuously tracks satellites and reports your precise position. It also is WAAS-capable, so it can determine your precise location to within 3 m (9.84 ft) ù without using an external DGPS beacon receiver. Built for Versatility: Part of the Garmin marine instrument family, the GPS 17x is built to withstand the elements. This waterproof sensor can be pole mounted or flush mounted. It also can be attached to the underside of many fiberglass decks for added ease of installation.