Humminbird 998c SI - Manual (Page 55)

45 What’s on the Sonar Display
What’s on the Sonar Display
The Fishing System can display a variety of useful information about the area under and adjacent to your boat, including the following items:
Sonar Color Bar - Color spectrum indicating
low to high sonar intensity returns, where
red indicates high intensity and white
indicates low intensity.
Depth - Water depth; can be set to alarm when the water becomes too shallow.
Temperature - Water surface temperature
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Timer - Elapsed time with Speed accessory or GPS Receiver. 2
Distance - Distance traveled with Speed accessory or GPS Receiver. 3
Average Speed - Average speed reading with Speed accessory or GPS Receiver. 4
Thermoclines - Layers of water with different
temperatures that appear at different depths
and different times of the year. A thermocline
typically appears as a continuous band of
many colors moving across the display at the
same depth. 8
Barometric Pressure - Requires optional-purchase
WeatherSense®
Bait Ball
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RTS™ (Real Time Sonar) Window
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Second Sonar Return - When the sonar
signal bounces between the bottom and the
surface of the water and back again. Use
the appearance of the second return to
determine bottom hardness. Hard bottoms
will show a strong second return, while soft
bottoms will show a very weak one or none
at all. 12
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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
Cursor - Available in Freeze Frame and can
be positioned in the Sonar View to provide
depth of a sonar retun and bottom depth
below the cursor. The Latitude and
Longitude of the cursor position, the
distance to travel to the cursor position, and
the bearing to the cursor position are
shown with a GPS Receiver attached.
Cursor information is displayed at the top of
the screen. 13
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