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 dis-
play screen by use of these VRMs. The depth to the VRM can be seen in the
left side of the screen.
7HITELINE Places a white/black line to indicate the sea floor, and blanks out
four pixels just below the line. The purpose of this is to help the user detect tar-
gets, such as fish, which are very close the the sea floor and whose echoes tend
to merge with those of the sea floor itself.
!PPENDIX! #%-+))'LOSSARYOFTERMS
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