The Clipper Compass is a fully electronic compass with remote fluxgate sensor. The large clear display has 7 levels of illumination and gives True or magnetic heading. The sensor which is gimballed for plus/minus 45 degrees of pitch and roll, is mounted in a position where stray magnetic fields are at a minimum. An electronic auto calibration then cancels out small errors. Steer to Course Function - When the steering function is selected a series of chevrons accumulate showing the magnitude and direction of the steering error. To stay on course simply turn the wheel in the direction of the chevrons until they are extinguished. The steering sensitivity can be preset by the user. An off course alarm provides a safety feature when not at the helm. If the heading deviates by more than a preset amount then the alarm will sound. Technical Specifications: Supply voltage nominal 12v DC Consumption, 120mA+ (25mA for display illumination max) Fluxgate accuracy +/- 1 degree Adjustable Damping 1 Degree display resolution Display case size 110 x 110 m Depth behind panel 30mm Fluxgate 175mm diameter x 95mm Sensor supplied with 5 meters of cable Face Cover included Extension cables availableThis product may not be returned to the original point of purchase. Please contact the manufacturer directly with any issues or concerns.