Simrad NSS evo2 series Installation Manual page 28

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Network echosounder
Enabling network sounder allows the display to use other compatible sonar sources on
ethernet as well as sharing it's own sonar with other devices.
Depth offset
This is a value that can be entered on the Echo
Installation page to make depth readings
relate to any point from the water surface, to
the deepest point of the vessel.
Below are some typical ways in which the offset is used:
A) For Depth below Keel: Set the distance from transducer to the bottom of the keel - this
should be set as a negative value.
B) For Depth Below Transducer: no offset required.
C) For Depth Below Surface (waterline): Set the distance from transducer to the surface - this
should be set as a positive value.
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 "NMEA 2000 and Ethernet device
upgrades" on page 39
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.
Select Auto correct to match water speed to ground speed (SOG).
Manual calculation. 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 five 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 influences to the measured temperature.
Calibration range: -9.9° - +9.9°. Default is 0°.
¼ Note:
Water temperature calibration only appears if the transducer is temperature capable.
Check transducer type selection if this option should be available.
Software setup | NSS evo2 Installation Manual
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