Eagle Electronics 640c manual Table of Contents

Table of Contents
Read Me First!	1
Capabilities and Specifications: FishMark® 640c	2
SeaFinder® 640c DF	2
How Sonar Works	4
How to Use this Manual: Typographical Conventions	5
Arrow Keys	5
Keyboard	5
Menu Commands	5
Instructions = Menu Sequences	5
Section 2: Installation & Accessories	7
Preparations	7
Transducer Installation	7
Recommended Tools and Supplies	8
Selecting a Transducer Location	9
How low should you go?	10
Shoot-Thru-Hull vs. Transom Mounting	11
Transom Transducer Assembly and Mounting	12
Trolling Motor Bracket Installation (single-frequency only)	19
Transducer Orientation and Fish Arches	20
Shoot-Thru-Hull Preparation	21
Testing Determines Best Location	22
Shoot-Thru-Hull Installation	24
Speed/Temperature Sensors	26
Optional Speed Sensor Installation	27
Power Connections	29
Mounting the Unit: Bracket, In-Dash or Portable	31
Bracket Installation	32
In-Dash Installation	34
Portable Installation	34
Basic Sonar Operation	37
Keyboard	37
Power/lights on and off	38
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