Furuno CH-37BB, Operator'S Manual

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4. 3D MODE
4-2
2. Select BOTTOM/3D with the [

] or [

] keys.
3. Select item with [

] or [

] keys. The selected item is highlighted and the current
setting is circumscribed.
4. Select value with [

] or [

] keys.
5. Press the MENU key to return to the BOTTOM/3D menu.
BOTTOM/3D menu description
4.3 Changing 3D View Scale Mode and Selection
The depth (z-axis) of the graph is displayed in either “TIMe” or “DISTance” scale
mode. The depth can be set to 500 or 1000 meters in the distance scale mode, or 1/
1, 1/2 or 1/4 in the time scale mode. The fraction means graph update/number of
transmission. “1/4” for example, means the graph is updated every four transmissions.
These selections are made on the 3D VIEW SCALE and TIME SCALE (or DISTANCE
SCALE) lines of the BOTTOM/3D menu.
The time mode should be selected when speed data is not being fed to the unit from
navaids or speed log.
Menu Description
TVG (LEVEL) Controls the receiver sensitivity in short to medium ranges
to eliminate surface noise, which may mask shallow targets.
TVG (TIME) Determines the TVG effective depth.
BEAM WIDTH Sets the vertical beam width is useful for searching a wide
area vertically but fish detection range is shortened since
the transmitted power attenuates.
AUTO TRAIN SECTOR Sets the train sector, 90°, 180°, 360°. Use a wide sector to
conduct a general search, narrowing it once a school of fish
is detected.
VERT. ECHO OVERLAY Turns on/off the vertical echoes.
3D VIEW SCALE Determines the depth item, time or distance for 3D display
mode. (Requires optional equipment)
TIME (DIST) SCALE Selects z-axis scale of 3D picture.
Frontal image Oblique image
Depth
Depth