What’s on the sonar display – Humminbird ] 981 User Manual
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WHAT’S ON THE SONAR DISPLAY
The 900 Series™ 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.
Speed - if a Speed accessory or GPS
Receiver is attached, the 900 Series™
can display the speed of the boat,
and can keep a triplog of nautical or
statute miles traveled.
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Distance - Distance traveled with Speed accessory or GPS Receiver.
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Average Speed - Average speed reading with Speed accessory or GPS Receiver.
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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.
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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.
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Triplog
Triplog
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