Furuno GP-1600F - Manual (Page 62)

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3.10 Brightening Fish Echoes
The BRT ECHO feature displays fish echoes in light tone and sea-
bed echoes in dark tone. This feature is useful for distinguishing
fish echoes close to the seabed.
OFF ON
Figure 3-17 Bright echo display
To turn on/off the bright echo;
1) Press the [MENU ESC] key.
2) Press the [6] key to display VIDEO SOUNDER SETUP menu.
3) Press the [▼] or [▲] key to select BRT ECHO.
4) Press the [t] or [s] to select ON or OFF.
5) Press the [MENU ESC] key.
3.11 Selecting Zoom Ratio
The ZOOM function set the marker zoom display ratio by two,
three, four or five times the normal picture.
To select zoom ratio, do the following;
1) Press the [MENU ESC] key.
2) Press the [6] key to display VIDEO SOUNDER SETUP menu.
3) Press the [▼] key to select ZOOM.
4) Press the [t] or [s] to select zoom ratio desired.
5) Press the [MENU ESC] key.