User`s guide

116 RayTech RNS V6.2 - User’s Guide
frequency (50 kHz for wide coverage or 200 kHz for a narrow, detailed
view), or you can set split frequency mode to display both frequencies
in different pages.
• Change the sonar display mode, for the active page, to view bottom
lock, A-scope or zoom images.
• Bottom lock provides a bottom up view. This mode is used prima-
rily to filter out the bottom structure and thus show fish more
clearly. Bottom lock can be displayed full page, or split with the
scrolling bottom image.
• A-Scope displays a real-time image of the bottom structure and
fish directly below the transducer. The A-scope is displayed along-
side the regular scrolling bottom graph.
• Zoom enlarges all or part of the bottom graph display so that you
can see more detail of the bottom structure, weeds etc. You can
select the magnification level and the zoom area. Zoom can be
displayed full page, or split with the scrolling bottom image.
• Isolate fish close to the bottom using White Line and Bottom Fill in the
active pane.
• Hide the depth digit in the current page.
Changing the range
The sonar automatically adjusts the display depth range, selecting the shal-
lowest range that keeps the bottom image in the lower half of the display
page. Alternatively the RANGE button on the Pathfinder panel lets you
select the maximum depth displayed on the scrolling bottom and A-scope
images. You can also set the shift value to move the image up or down
within the current range. When auto-range is selected, the shift adjustment
is disabled and the value is ignored.
For full details of range and shift values refer to Range and shift values -
page 188.
To adjust the range:
1.Click RANGE on the Pathfinder panel. This sets the
adjustment to manual and the range softkeys are displayed.
2.Click RANGE to adjust the range as follows:
i.Click
OUT to select a shallower range.
ii.Click
IN to select a deeper range.
Selecting the operating frequency
The sonar uses dual frequency - 50 kHz and 200 kHz - to provide the
optimum image at different depths and can be used in either auto or
manual modes. The frequency setting is indicated in the status bar.
In Auto frequency the sonar automatically selects the appropriate
frequency, based on the current display range. As the depth increases, the
sonar switches from 200 kHz to 50 kHz at 250 ft. (80m). As the depth
decreases, the sonar switches from 50 kHz to 200 kHz at 150 ft(50m). This
affects all sonar widows. The Auto frequency setting is useful for automati-
cally searching for the bottom.
In Manual frequency the following options are available:
• Single frequency mode.
- In which you select the sonar frequency that is displayed in all sonar
pages.
• Dual frequency mode.
- In which the transducer operates in both 50 kHz and 200 kHz
frequencies at the same time and you select the frequency that is
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