Garmin GPSMAP 721xs Owner's Manual - Page 61
Configuring My Boat, Keel OFFset, CaliBrate Water SpeeD
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Configuring My Boat To configure settings for your boat, from the Home screen, select Configure > My Boat. Keel Offset-offset the surface reading for the depth of a keel, making it possible to measure depth from the bottom of the keel instead of from the transducer location. Enter a positive number to offset for a keel. Enter a negative number to compensate for a large vessel that may draw several feet of water. To adjust the Keel Offset: 1. From the Home screen, select Configure > My Boat > Keel Offset. 2. Use the Rocker to enter the measured distance from the transducer location to the water line or to the keel of the boat. • If you are measuring down to the keel (transducer installed at the water line), enter a (+) positive number. This shows the depth at the bottom of the keel. • If you are measuring up to the water line (transducer installed on the bottom of the keel), enter a (-) negative number. This shows the depth at the surface. 3. Select Done to accept the number. Transducer at Surface A (+) positive number shows depth at the bottom of the keel. Transducer at the Bottom of the Keel A (-) negative number shows depth at the surface. Configuring the Chartplotter Temp Offset-set the temperature offset for the temperature sensor of your transducer. Calibrate Water Speed-use this menu to calibrate a speed-sensing device. Follow the on-screen directions for calibration. If you do not have a speed-sensing device, this menu does not appear. Note: If the boat is not moving fast enough or the speed sensor is not registering a speed, a "Speed Too Low" message appears. Select OK, and safely increase the speed of the boat. If you get the message again, stop the boat and make sure the speed-sensor wheel is not stuck. If the wheel turns freely, check the cable connections. If you continue to get the message, contact Garmin Product Support. GPSMAP 400/500 Series Owner's Manual 55