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The speedometer is calibrated at the factory however, significant variations can occur due to changes in installations. The speedometer can be easily calibrated to a known reference such as a radar gun, measured course, or GPS. When the unit is in digital speed display mode, push and release M to put the speedometer in the calibration mode. Push and hold M down for at least two seconds, the LCD will show “AdJUST.” Calibration Display CORC117 Run the boat at a constant 30 MPH as measured by the G