GPSMAP
®
4000/5000 Series Owner’s Manual 95
Sonar
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 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 > > .
5. Enter the temperature offset calculated in step 3:
• For the GPSMAP 4000 series, use the or the to enter the temperature offset.
• For the GPSMAP 5000 series, use the on-screen keyboard to enter the temperature offset.
6. Select .
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