Furuno FSS-3BB, Operator'S Manual

Page: 34 / 121

1. OPERATION
1-22
1.13.2 Bottom zoom mode
This mode magnifies the seabed, and also any fish near the seabed, on the left-side
of the screen, and is useful for determining seabed contours. When the seabed depth
increases, the display automatically shifts to keep the seabed echo at the lower part
of the screen.
1.13.3 Marker zoom mode
The marker zoom mode magnifies the specified area of the normal picture to full ver-
tical size of the screen on the left-side of the screen. You may specify the portion to
expand by operating the VRM (Variable Range Marker). The area between the VRM
and zoom marker is expanded. This mode is useful for determining the size of fish in
the midwater.
Bottom zoom
mode displayed Un-zoomed single
frequency displayed
Zoom area automatically follows the
seabed when the depth changes.
Zoom markers
Bottom Bottom
Marker zoom
area displayed
Zoomed area
Zoom marker
Un-zoomed single
frequency displayed
VRM