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Software setup | NSO evo2 Installation Manual
Depth o set
As transducers measure water depth from
the transducer to the bottom, water depth
readings do not account for the distance from
the transducer to the lowest point of the boat
in the water (for example; bottom of the keel,
rudder, or outboard skeg) or from the transducer to the water surface. Depth off set should be
used to take this in to account, and display a corrected depth.
A
B
A For Depth below Keel: Set the distance from transducer to the bottom of the skeg -
this should be set as a negative value.
B For Depth Below Surface (waterline): Set the distance from transducer to the surface
- this should be set as a positive value.
¼ Note: If depth at water surface is the preferred measurement, it is important any operator of
the vessel is aware of this confi guration!
Echosounder software version
For external sounder modules, the software version is displayed in the header of the Echo
Installation dialogue. To upgrade Sonar software, see "Software upgrade of other networked
devices" on page 41
Water speed calibration (echosounder transducer)
Water speed calibration is used to adjust the speed value from the paddle wheel to match the
actual boat speed through the water. Actual speed can be determined from GPS speed over
ground (SOG) or by timing the boat over a known distance. Water speed calibration should be
performed in calm conditions, with minimal wind and current movement.
Increase this value above 100 % if the paddle wheel is under reading, and decrease this value
if it is overreading, e.g. if the average water speed reads 8.5 knots and SOG records 10 knots
the calibration value needs to be increased to 117 %. To calculate the adjustment, divide the
SOG by the paddlewheel speed, and multiply the product by 100.
Calibration range: 50-200 %. Default is 100 %.
Water speed averaging (echosounder transducer)
Averages water speed by measuring your speed at a selected interval of time. Water speed
intervals range from one to thirty seconds, e.g. if you select fi ve seconds, your displayed water
speed will be based on averaging over 5 seconds of sampling.
Calibration range: 1-30 seconds. Default is 1 second.
Water temperature calibration (echosounder transducer)
Temperature calibration is used to adjust the water temperature value from the echosounder
transducer to match the data from another temperature sensor. It may be required to correct
for localised infl uences to the measured temperature.
Calibration range: -9.9° - +9.9°. Default is 0°.
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