Navico B&G User Manual - page 40

Commission the System 

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Echosounder Setup

 Depth Offset

Is a value that can be entered to make the depth on the Echo page represent either 

depth below the transducer or depth below the surface.

A) Depth below Keel value: Is the distance from transducer to the keel: 

Enter a negative value. 

B) Depth Below Transducer: no offset required.

C) Depth Below Surface (waterline) value: Is the distance from transducer to the 

surface: 

Enter a positive value. 

A

B

C

 Water Speed Calibration

Water Speed Off Set

Water speed calibration is used to adjust the speed 

value from the paddle wheel to match the actual 

speed. This can be measured either from the GPS 

speed over ground (SOG) or by timing the boat 

over a known distance. Water speed calibration 

should be performed with as little wind and current 

movement as possible.

Select Auto correct to match water speed to 

ground speed

Manual calculation. If in average the water speed 

reads 8.5 knots and SOG records 10 knots. 

Increase the offset to 117%. The calculation is:

Difference in speed

Paddle wheel speed

x 100. 

If water speed is lower than SOG then increase the 

calibration value.

Calibration range is 10-400 % Default is 100 %

Echo sounder software version

Software versions are displayed under Sonar installation. To upgrade Sonar software 

refer to Software upgrades