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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