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decrease it. The bar graph and
percentage number shows the
level of surface clarity in use.
Press the CLR key when you're
finished.
DIGITAL SONAR
Each SAM actually has two
sonar units in one box. One
sonar is dedicated to the graph
display, the other is the digital
sonar display. The digital sonar
is responsible for the digital depth display and the automatic features. If the
digital bottom depth display in the upper left corner of the screen flashes,
this means the digital sonar has lost the bottom and is trying to reacquire
it. The number that it flashes is the last known water depth.
You can turn the digital sonar off, if desired. Although you will lose all
automatic functions and depth
alarms, the chart display will be
speeded up slightly.
To turn the digital sonar off,
press the MENU key, then
press the key adjacent to the
"Sonar Controls" label. Now
press the key next to the "More"
label until the Digital Sonar
menu appears as shown at
right. Press the key adjacent to
that label. The menu shown
below appears. Now press the key adjacent to the "Digital Sonar ON OFF"
label. To turn the digital sonar on again, repeat the above steps.
KEEL OFFSET
The keel offset feature lets you compensate for the transducer's location
on the boat. Since this sonar unit measures water depth from the face of
the transducer to the bottom, there can be a significant difference between
the actual water depth and the depth displayed on the sonar unit. For
example, suppose you mount a bolt-thru-hull transducer on the bottom of
the hull. When you launch the boat you find that this location places the
transducer three feet below the water's surface. Therefore, the depth
sounder always reads three feet shallower than the actual water depth. (In
other words, if the bottom is 50 feet deep, the depth sounder will read 47
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