Simplifying The Bottom Image - Raymarine C Series Reference Manual

Chapter 5: Using the Fishfinder

Simplifying the bottom image

When you are looking for fish that feed close to the bottom, you can use the Bottom
Lock function to filter out and flatten the bottom structure and display the fish (or any
other objects directly above the bottom) more clearly.
Bottom Lock is selected for individual fishfinder windows and can either replace (ON)
or appear alongside (SPLIT) the standard fishfinder image.
If the A-Scope or Zoom image was displayed, selecting Bottom Lock automati-
Note:
cally switches OFF A-Scope and Zoom.
Depth
reading
Bottom
shift
Adjusting bottom lock range/position
Adjusting the range of the bottom lock image allows you to view more bottom details.
You can also reposition the image on screen to anywhere between the bottom of the
window (0%) and the middle of the window (50%):
BOTTOM LOCK...
Bottom lock range (distance from bottom)
200 kHz: Auto
BL
BOTTOM LOCK B-LOCK RANGE
ON SPLIT OFF 50ft
Bottom lock image
BOTTOM LOCK
ON
BOTTOM LOCK
Gain: Auto High
BOTTOM SHIFT
14%
B-LOCK RANGE
BOTTOM SHIFT
SPLIT SPLIT
Depth from the surface
Standard fishfinder image
20ft
Adjust as
10%
required
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