Simrad NSS evo3, Руководство по установке

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All transducers measure water depth from the transducer to the bottom. As a result, water
depth readings do not account for the distance from the transducer to the lowest point of
the boat in the water or from the transducer to the water surface.
To show the depth from the lowest point of the boat to the bottom, do the following. Before
setting the Structure offset, measure the distance from the structure transducer to the lowest
point of the boat in the water. If, for example, the distance is 0.3 m (1 ft), it will be input as
(minus) - 0.3 m (-1 ft).
To show the depth from the water surface to the bottom, do the following. Before setting
the Structure offset, measure the distance from the structure transducer to the water surface.
If, for example, the distance is 0.3 m (1 ft), it will be input as (plus) 0.3 m (1 ft).
A setting of 0 (zero) causes the depth displayed to be the distance from the transducer to the
bottom.
Overlay downscan
When a DownScan source is connected to your system, you can overlay DownScan images
on the regular Echosounder image.
When activated, the Echosounder menu expands to include basic DownScan options.
Echosounder installation
Use this dialog to setup and configure available Echosounder sources.
Source
Select this option to display a list of Echosounder sources available for setup. The settings
you make in the rest of the dialog pertain to the source selected. The sources setup in this
dialog are available for selecting to display in the image in the Echosounder panel.
Search depth
Noise may cause the echosounder to search for unrealistic depths. By setting the search
depth manually the system displays echoes received from objects within the set depth
range.
Depth offset
All transducers measure water depth from the transducer to the bottom. As a result, water
depth readings do not account for the distance from the transducer to the lowest point of
the boat (for example; bottom of the keel, rudder, or skeg) in the water or from the
transducer to the water surface.
Before setting the offset, measure the distance from the transducer to the lowest point of the
boat in the water or from the transducer to the water surface.
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Software Setup | NSS evo3 Installation Manual