If you have a speed-sensing transducer connected to the chartplotter, you can calibrate that speed-sensing device to improve the accuracy of water-speed data displayed by the chartplotter.
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Select
.
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Follow the on-screen instructions.
If the boat is not moving fast enough or the speed sensor is not registering a speed, a message appears.
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Select
OK, and safely increase the boat speed.
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If the message appears again, stop the boat, and ensure the speed-sensor wheel is not stuck.
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If the wheel turns freely, check the cable connections.
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If you continue to get the message, contact
Garmin® product support.