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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
4
9
8
7
2
6
3
1
5
The SeaFinder 640c DF sonar unit showing
full sonar chart screen display and keyboard.
37
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