Raymarine H6, Owner'S Manual, Page: 93 / 192

Using sonar 79
I
mproving the underwater view
The sonar automatically locates the bottom and displays the information as a
scrolling image using an appropriate scroll speed and range. To change the view
to suit your current activities and operating conditions, you can control how the
fishfinder image and depth information is displayed as follows:
• Change the displayed range; this affects all sonar pages.
• View single and dual frequency sonar; this affects all sonar pages. The sonar,
by default, automatically determines the optimum frequency of operation
according to depth. You can manually select the transducer 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 primarily 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 alongside 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.
• Hide the depth digit in the current page.
Changing the range
The sonar automatically adjusts the display depth range, selecting the shallowest
range that keeps the bottom image in the lower half of the display page.
Alternatively the RANGE buttons in the tool box 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 Appendix C:Sonar .
81238_1.book Page 79 Thursday, September 16, 2004 2:49 PM