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USING THE 160
MODES OF OPERATION
depending on the number of fish
and boat speed. Individual fish
appear as smaller black and gray
lines often appearing as a "fish
arch." A fish arch forms as the fish
moves through the sonar beam.
Due to the transducer beam angle
the distance to the fish decreases
as it moves into the beam, and
then increases as it moves out.
When the chart window graphs
this distance change, an arch appears. Boat
speed, the Chart Speed setting and
movement of the fish greatly affect the
shape of the arch. When moving slowly, a
fish creates an elongated arch. With the
boat moving fast the arch appears shorter.
A partial arch forms when the fish does not
move through the entire cone angle.
It is important to remember that sonar cannot distinguish between a fish
and some other object suspended in the water. Regardless of the object the
sonar detects, each has the possibility of being drawn as an arch.
MODES OF OPERATION
Three modes of operation control the method the 160 uses to track the
bottom and select depth ranges. The Mode
is selected by changing the C
setting to A
(Bottom Lock).
A
M
UTOMATIC
Automatic Mode follows the bottom contour, changing depth ranges as
needed to keep the most recent sonar returns visible on the display.
Automatic Mode keeps the bottom visible at all times, showing sonar
returns from the surface to the bottom and just beyond. This is useful when
traveling across the water in areas where the depth constantly changes
requiring frequent range changes.
12
, M
, or BTM L
UTO
ANUAL
ODE
P
ONTROL
ANEL
OCK
Fish Arch Diagram
Bait fish
Fish Arch
Partial Fish
Arch
Structure
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