San Jose’s GM-44UB-DR Receiver combines a new generation of concurrent GNSS solution and 3D automotive Dead Reckoning (ADR) technology. With 3D accelerometer, gyroscope sensor, and speed pulse input, GM-44DR delivers continuous positioning for road vehicles during periods of signal loss such as in tunnels and parking garages.The GM-44DR GNSS Receiver/Smart Antenna has a low profile, robust and waterproof enclosure with metallic bottom. It interfaces to a RS-232 serial comm. port of your computing device that utilizes NMEA 0183 data output sentences.The GM-44DR Locator has high sensitivity and fast GNSS signal acquisition. In combination with speed information from the vehicle, the inertial navigation solution provides 100% coverage indoor/outdoor vehicle positioning during large multi-path related environments.