Sonar

Transducer Configuration

Setting the Keel Offset

The keel offset compensates for 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. You can enter a negative number to compensate for a large vessel that may draw several feet of water.

1.Complete an action, based on the location of the transducer:

•If the transducer is installed at the water line ➊, measure the distance from the transducer location to the keel of the boat. Enter this value in step 3 as a positive number.

•If the transducer is installed at the bottom of the keel ➋, measure the distance from the transducer to the water line. Enter this value in step 3 as a negative number.

➊

➋

Keel Offset

2.From the Home screen, select Configure > My Boat > Keel Offset.

3.Enter the distance measured in step 1. Ensure that you enter a positive or a negative number based on the location of the transducer.

4.Select Done.

Setting the Water Temperature Offset

You must have a NMEA 0183 water-temperature sensor or a temperature-capable transducer to measure water temperature.

The temperature offset compensates for the temperature reading from a temperature sensor.

1.Measure the water temperature using the temperature sensor or temperature-capable transducer that is connected to the chartplotter.

2.Measure the water temperature using a different temperature sensor or a thermometer that is known to be accurate.

3.Subtract the water temperature measured in step 1 from the water temperature measured in step 2.

This is the temperature offset. Enter this value in step 5 as a positive number if the sensor connected to the chartplotter measures the water temperature as being colder than it actually is. Enter this value in step 5 as a negative number if the sensor connected to the chartplotter measures the water temperature as being warmer than it actually is.

4.From the Home screen, select Configure > My Boat > Temp Offset.

5.Enter the temperature offset calculated in step 3.

6.Select Done.

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GPSMAP 700 Series Owner’s Manual