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Humminbird 858C Manual

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What’s on the Side Imaging® Display
What’s on the Side Imaging® Display
(898c SI and 998c SI only)
Side Imaging® displays a number of easily recognizable features that allow for accurate interpretation of bottom contour and structure. For Side Imaging®, the bottom
composition determines the intensity of the sonar return. For example, rock and gravel provide a clearer sonar return than mud and sand because of their relative
density. Upward slopes that face the transducer reflect sonar better than downward slopes that face away from the transducer. You can find a number of easily
recognizable features on the Side Imaging® display that allow for accurate interpretation of bottom contour and structure, including the following items:
Side Imaging® Range - Images shown on the right side of the
screen are located on the right side of your boat, and images
shown on the left side of the screen are located on the left side
of your boat. In this illustration, the sonar is pinging 148 feet
on each side.
Topography Changes - The light part of the screen shows
where the beam is hitting hard bottom or rising terrain. The
dark part of the screen indicates soft bottom (sand, mud) or
descending terrain.
Depth - Water depth; can be set to alarm when the water becomes too shallow.
1
Timer - Elapsed time with Speed accessory or GPS Receiver.
Water column - Shows the relative depth of the water under
the boat at a given time. Variations in the width of the water
column show variations in the distance to the bottom as the
boat passes over.
2
Distance - Distance traveled with Speed accessory or GPS Receiver.
3
Average Speed - Average speed reading with Speed accessory or GPS Receiver.
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Shadows - Result from a lack of reflected sonar from a particular
area and can be more valuable for interpretation than the sonar
reflected by the object itself. Use shadows to help you see the
image in 3 dimensions, oriented in space. You can gain insight
into the actual shape of an object, or the depth to which it has
sunk into the bottom, through shadows on the display. Objects
standing on the bottom cast a sonar shadow. The longer the
shadow, the taller the object. Fish also cast shadows. You can
use the shadow to interpret how close the fish is to the bottom.
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Barometric Pressure - Requires optional-
purchase WeatherSense®
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Triplog
Triplog
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Top of the Display - Information from the side beams are
displayed at the top of the screen. As new information is
received, the historical data scrolls down the screen. For the
most current information, watch the top of the screen.
Clouded Area - May indicate a bait ball and White Streaks
may indicate fish.
Freeze Frame & Zoom - Use the 4-WAY Cursor Control key to
move the cursor to an area on the screen, and press the
ZOOM+ key to see the sonar returns in greater detail.
Temperature - Water surface temperature
6
Speed - If a Speed accessory or GPS Receiver
is attached, the Fishing System can display the
speed of the boat, and can keep a triplog of
nautical or statute miles traveled.
7
Bottom Return
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