Lowrance Precision-9 Compass Precision-9 Compass Installation Guide - Page 4

Manual calibration Manual calibration is also possible, and requires turning the vessel through several full circles. There are two ways to start a manual calibration: -- By pressing the Calibrate button in the setup dialog from a Navico display unit. -- By doing 2 consecutive 360 degree turns within 5 minutes after power is applied to the compass. ¼¼ Note: If you use the Precision-9 with a non-Navico display unit, you can use method 2 above to start manual calibration. Once calibration is started, you can complete calibration by doing another 390 degree turn with a steady, stable, low rate of turn 2-3°/second. If you use method 1 to start calibration, the on-screen instructions will guide you. Once calibration is complete, a message will appear. Offsets An offset can be applied for the heading, roll and pitch outputs. This offset is meant to compensate for any mounting offset. For roll and pitch, offsets should be set so that the output values are 0 while stationary at the dock. The heading offset option is used for compensating for any difference between the boat's center line (A) and the compass lubber line (B). x 1. Find the bearing from the boat position to a visible object. Use a chart or a chart plotter 2. Steer the boat so that the center line of the boat is aligned with the bearing line pointing A towards the object. B 3. Change the Offset parameter so that the bearing to the object and the compass readout become equal. ¼¼ Note: Make sure that both the compass heading and the bearing to the object have the same unit (Magnetic or True). ¼¼ Note: Be aware that the displayed heading and bearing values may be damped. Allow time for the heading and bearing values to settle before applying offset. Displaying compass data Select the Data button to display the data the compass is providing to the NMEA 2000 network. 4 | Precision-9 Installation Guide