Humminbird 561, 570 DI Power On, How Sonar Works, What’s on the Sonar Display, What’s on the Down Imaging™ Display, Views, What's on the 500 Series™ Control Head, Key Functions

Table of Contents
Power On	1
How Sonar Works	2
Single Beam Sonar (550, 560) ....................................................................................	4
DualBeam Sonar (570) ................................................................................................	5
DualBeam PLUS™ Sonar (561)....................................................................................	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
SwitchFire™ ..........................................................................................................	10
Freeze Frame and Active Cursor.............................................................................	10
Instant Image Update............................................................................................	10
Bottom Presentation..............................................................................................	11
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 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

i