Furuno FCV-668 - Measuring Depth to a Fish School; A-Scope Display

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2.9 Measuring Depth to a Fish School
The VRM (Variable Range Marker) functions to measure the depth to fish schools or other echo.
1. Press [▲] or [▼] to place the VRM on an echo.
2. Read the VRM range just above the VRM.
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VRM (green)
2.10 A-scope Display
This display shows echoes at each transmission with amplitudes and tone proportional to their
intensities, on the right 1/4 of the screen. It is useful for estimating the kind of fish school and
bottom composition. To turn the A-scope display on or off press the [SIG LEV] and [ALARM]
keys together.
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A-scope
display
Normal
display
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