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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 w indow graphs
this distance change, an arch appears. Boat
speed, t he Chart Speed set t ing and
movement of the fish greatly affect the
shape of the arch. When moving slow ly, a
fish creates an elongated arch. W ith 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 betw een a fish
and some other object suspended in the w ater. Regardless of the object the
sonar detects, each has the possibility of being draw n as an arch.
M ODES OF OPERATION
Three modes of operation control the method the
bottom and select depth ranges. The M ode
is selected by changing the C
set t ing t o A
(Bottom Lock).
A
M
UTOM ATIC
Automatic M ode follow s the bottom contour, changing depth ranges as
needed to keep the most recent sonar returns visible on the display.
Automatic M ode keeps the bottom visible at all times, show ing sonar
returns from the surface to the bottom and just beyond. This is useful w hen
traveling across the w ater in areas w here the depth constantly changes
requiring frequent range changes.
12
, M
, or BTM L
UTO
ANUAL
ODE
P
ONTROL
ANEL
OCK
Fish Arch Diagram
160
uses to track the
Bait fish
Fish Arch
Partial Fish
Arch
Structure
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