Humminbird 4090501 Power On, How Sonar Works, How GPS Works, What’s on the 300 Series™ Control Head, Key Functions, SD Card Slot, What’s on the Sonar Display

Table of Contents
Power On	1
How Sonar Works	2
DualBeam PLUS™ Sonar (DualBeam PLUS™ models only [386ci]) ..............................	4
Down Imaging™ Sonar (Down Imaging™ models only [386ci DI]) ................................	5
Dual Beam Ice Transducer (optional-purchase XI 9 20 Ice Transducer only) ..................	6
How GPS Works	7
What’s on the 300 Series™ Control Head	8
Key Functions	9
POWER/LIGHT Key ..................................................................................................	9
VIEW Key ............................................................................................................	10
CHECK/INFO key ..................................................................................................	10
MENU Key ..........................................................................................................	10
4-WAY Cursor Control Key ...................................................................................	11
MARK Key ............................................................................................................	12
GOTO Key ..............................................................................................................	12
ZOOM (+/-) Key....................................................................................................	12
EXIT Key ..............................................................................................................	13
SD Card Slot	14
Add Maps to YourFishfinder ...............................................................................	15
Import Navigation Data..........................................................................................	16
Export Navigation Data ..........................................................................................	16
Update Software ..................................................................................................	18
What’s on the Sonar Display	20
Understanding the Sonar Display.........................................................................	22
Real Time Sonar (RTS™) Window ........................................................................	22
Sonar Colors and Bottom View.............................................................................	23
SwitchFire™..........................................................................................................	25

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