Humminbird 561 - Manual (Page 4)

Power On 1
How Sonar Works 2
Single Beam Sonar (550, 560) .................................................................................... 4
DualBeam PLUS™ Sonar (561, 570) .......................................................................... 5
Down Imaging™ Sonar (570 DI) .................................................................................. 6
What’s on the Sonar Display 7
Understanding the Sonar Display ............................................................................ 9
Real Time Sonar (RTS™) Window ............................................................................ 9
Sonar Returns and Bottom View ............................................................................ 10
SwitchFire™ ............................................................................................................ 12
Freeze Frame and Active Cursor ............................................................................ 12
Instant Image Update ............................................................................................ 12
What’s on the Down Imaging™ Display
(Down Imaging™ models only [570 DI])
13
Understanding the Down Imaging™ Display ........................................................ 15
Interpreting the Display .......................................................................................... 15
Down Imaging™ Sensitivity .................................................................................. 16
Freeze Frame and Active Cursor ............................................................................ 16
Views 17
Sonar View .............................................................................................................. 19
Sonar Zoom View .................................................................................................... 20
Split Sonar View
(DualBeam PLUS™ and
Down Imaging™ models only [561, 570, and 570 DI]) .................................................. 21
Big Digits View ........................................................................................................ 22
Down Imaging™ View
(Down Imaging™ models only [570 DI]) .................................... 23
Down Imaging™/Sonar Combo View (Down Imaging™ models only [570 DI]) ............ 24
What's on the 500 Series™ Control Head 25
Key Functions 26
POWER/LIGHT Key .................................................................................................. 26
VIEW Key.................................................................................................................. 27
MENU Key ................................................................................................................ 27
Table of Contents
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