Compared to units with slower update rates, the GPS 19x offers dramatic improvement when used at low speeds. Position and course information from slower units can jitter and swing considerably at speeds below 1 mph. The GPS 19x provides a consistent and smooth heading which is especially important when trying to hit a specific waypoint or mark. This 32-channel receiver is capable of tracking multiple global navigation satellite systems, including GPS, GLONASS, Galileo and QZSS. Includes Pole, Surface, & Underdeck mounts as well as power/data cable & update rate select cable.