
is to help the user detect targets, such as fish, which are very close to the
sea floor and whose echoes tend to merge with those of the sea floor it-
self.
62- - Variable Range Marker. This refers to a horizontal black line
shown on the display screen. The user can measure the range to targets
shown on the display screen by use of these VRMs. The depth to the
VRM can be seen in the left side of the screen.
%1-+))'LOSSARYOFTERMS !PPENDIX!
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