What's On The Down Imaging™ Display (858C Di, 958C Di, 898C Si, And 998C Si Combo Models Only) - Humminbird 858c Combo Operation Manual

What's on the Down Imaging™ Display
Down Imaging™ uses unique sonar technology to provide information about the area directly below your boat. The razor-thin, high- definition profiling beams
produce the detailed sonar data that you see on the display. Down Imaging™ reveals a variety of recognizable features so that you can interpret the structure
and bottom contour, including the following items:
1
2
3
4
7
1
Depth - Water depth can be set to alarm when the water becomes too shallow.
2 Timer - Elapsed time with Speed accessory or GPS Receiver.
3 Distance - Distance traveled with Speed accessory or GPS Receiver.
3
4 Average Speed - Average speed reading with Speed accessory or GPS Receiver.
NOTE: Entries in this view that list (with Temp/Speed or GPS Receiver) are available if either device is connected to the 800/900 Series™ Fishing System. If both devices are
connected, then only the information from the GPS receiver will be displayed on the view.
(858c DI, 958c DI, 898c SI, and 998c SI Combo models only)
13
10
8
9
11
12
6
5 Upper Range
6
Lower Range
23
7 Speed - If a GPS Receiver or Temp/Speed accessory is
connected, the Fishing System can display the speed of the
boat and can keep a Triplog of nautical or statute miles
5
traveled.
8
Structure
9 Shadows - Result from a lack of reflected sonar from a
particular area and can be as 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.
Topography Changes - The light part of the display shows
10
where the beam is hitting hard bottom or rising terrain. The
dark part of the display indicates soft bottom (sand, mud) or
descending terrain.
11 Bottom Return - Use the appearance of the bottom return to
determine bottom hardness. Rock and gravel provide a clearer
sonar return than mud and sand because hard objects reflect
sonar better than soft objects.
Freeze Frame & Zoom - Use the 4-WAY Cursor Control key to
12
move the cursor to an area on the screen, and press the
ZOOM+ key to see the sonar returns in greater detail.
Clouded Area may indicate a bait ball and White Streaks may
13
indicate fish.
What's on the Down Imaging™ Display