AcquaLink NavSensorMaximum reliability and progressive technology in premium quality.The multifunctional VDO AcquaLink NavSensor is truly the gem of all sensors. Its integrated 66 channel GPS module can track 22 satellites to provide accurate vessel speed, while the the inertial sensor provides pitch & roll (up and down) and YAW (sideways) motion data.Compass readings can be displayed electronically, thanks to the fluxgate which also can be used for course corrections in autopilots and enables MARPA functionality on compatible chartplotters. The barometer and air temperature sensors provide current weather information.The NavSensor can be calibrated independently. Press and hold the rubber calibration button for more than 5 seconds; the LED will start flashing red. Initiate one 360 degree clockwise circle’ The LED will turn off; press the button and the LED will blink again. Complete one 360 degree counterclock circle. After completion the LED will blink green. The unit is now calibrated.Included:NavsensorFlat mount bracketPole mount bracketInstallation instructionMounting screws (not magnetic)Warning Sticker