NorthStar Navigation NorthStar 8000i - Manual (Page 119)

Northstar 8000i Operation Manual 119
19 Set up the sounder
You can make the following changes. These changes are global, meaning that
they'll apply to all the Sounder screens.
You can:
•
enter the transducer depth for your vessel
•
enter an offset if you need to calibrate the water temperature readout
•
enter a filter value to average the temperature readout over a number of
readings
•
select the sounder speed offset value if you need to calibrate the sounder
speed
•
enter a filter value to average the speed readout over a number of readings
IMPORTANT: You must enter an accurate transducer depth to obtain correct depth
information from the sounder.
19.1 Change the transducer depth
The transducer depth is the difference in depth between the water line and the
location of the transducer on the hull.
The depth column on the extreme right of the Sounder screen shows the DBT
(Depth Below Transducer), and not the the depth below the water line.
The default offset is 0. (This default assumes that the transducer is located on the
hull at the water line.)
You must enter an accurate value for the transducer depth. If you don't, all the depths on
the Sounder screens will be wrong.
To change the transducer depth:
1. Select
Display.
2. Select Setup from the control panel.
3. Select
+ Sounder to display a list of sounder specification options.
4. The Transducer Depth button shows the current setting. Select
Edit, then enter the difference in depth between the water line and
the transducer. For example, if the transducer is 5 ft (1.5 m) below the
water line, just enter 5. If you want to check or change the distance
units, (see "Select the small scale distance units" page 31) .
5. The new setting is applied immediately to all the Sounder screens.
6. When you are finished, select – Sounder.