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Shallow Alarm Bar
Located on the right side of the depth ruler showing the range outside of which the depth
measurement will trigger a Shallow Alarm.
Range Bar
Vertical graduated bar that is located along the right side of the screen. It is a scale
which reflects the depth of the area being displayed.
Variable Depth Marker (VDM)
Horizontal line on to the Fish Finder page window with a depth label. Move the
ShuttlePoint knob Up or Down to change the position of the VDM. The label displays
the depth of the cursor position. The VDM can be moved to any location pinpointing the
depth of a target.
A-Scope
Real time representation of fish and bottom features passing through the beam of the
transducer, drawn as column of horizontal lines whose length and hue is proportional
to the echo strength returned. The stronger the echo the larger shall be the line height.
The hue depends on the currently selected palette. When the default palette is
selected, the strongest sonar returns will be shown as red and weaker returns will be
shown blue.
Deep Alarm Bar
Located on the right side of the depth ruler showing the range outside of which the depth
measurement will trigger a Deep alarm.
Transmit Frequency
Shows the selected depth transmit frequency.
4.1 UNDERSTANDING THE FISH FINDER DISPLAY
Figure 4.1 - The Fish Finder display
Fishes
Fishes are represented as arcs because of the cone angle of the transducer. In fact as
the boat passes over the fish the leading edge of the cone strikes the fish, causing a
display pixel to be turned on. As the boat passes over the fish, the distance to the fish
decreases turning each pixel on at a shallower depth on the display. When the boat is
directly over the fish, the first half of the arch is formed and since the fish is closer to
the boat, the signal is stronger and the arch is thicker. As the boat moves away from
the fish, the distance increases and the pixels appear at progressively deeper depths
forming the remaining half of the arch.