B&G Zeus 12 - Manual (Page 40)

Commission the System | 39
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