37
Basic Sonar Operation
This section addresses the unit's
most
basic
sonar operations. The in-
structions presented in Sec. 3 follow a chronological order. Sec. 4,
Sonar
Options & Other Features
, will discuss the more advanced functions
and utilities. Material in Sec. 4 is arranged in alphabetical order.
Before you turn the sonar unit on, it's a good idea to learn about the dif-
ferent keys, the Main Menu, the four Page screens and how they all
work together. BUT, if you just can't wait to get on the water, turn to
the one-page
Quick Reference
on page 45.
Keyboard
The SeaFinder 640c DF sonar unit showing
full sonar chart screen display and keyboard.
5
2
8
7
9
6
3
1
4
Summary of Contents for FISHMARK 640C
Page 6: ...iv Notes ...
Page 42: ...36 Notes ...
Page 48: ...42 Sonar page in Split Zoom Sonar Chart display mode Sonar page in Digital Data display mode ...
Page 58: ...52 Notes ...
Page 98: ...92 Notes ...
Page 104: ...98 Notes ...