23
A
A
A
A
A
BOAT'S DIRECTION OF TRAVEL
BOAT'S DIRECTION OF TRAVEL
BOAT'S DIRECTION OF TRAVEL
BOAT'S DIRECTION OF TRAVEL
BOAT'S DIRECTION OF TRAVEL
A
A
A
A
A
C
C
C
C
C
B
B
B
B
B
B
B
B
B
B
C
C
C
C
C
FISH ARCHES
FISH ARCHES
FISH ARCHES
FISH ARCHES
FISH ARCHES
Fish arches are created when the cone of sound passes over a fish. The
distance to a fish when the cone first strikes it is shown as "A" below.
When the center of the cone strikes the fish, the distance is shorter as
shown "B". As the cone leaves the fish, the distance increases again as
shown in "C".
When the Fish I.D. mode is off, the depth of the water will affect the size
and shape of the fish arch due to the cone angle diameter. For example,
if the cone passes over a fish in shallow water, the signal displayed on
the unit may not arch at all. This is due to the narrow cone diameter and
the resolution limitations of the display.
Very small fish probably will not arch at all. Medium sized fish will show a
partial arch, or a shape similar to an arch if they’re in deep water. Large
fish will arch, but turn the sensitivity up in deeper water to see the arch.
Because of water conditions, such as heavy surface clutter, ther-
moclines, etc., the sensitivity sometimes cannot be increased enough to
get fish arches.
Summary of Contents for Fish ID 128
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