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Section 3: 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 other more advanced functions
and utilities. Material in Sec. 4 is arranged in alphabetical order.
Before you turn on the sonar unit, it is a good idea to learn about the
different 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 47.
Keyboard
SeaCharter 642cDF iGPS unit showing map with sonar page, key-
board and access door for MMC cards.
1. PWR/LIGHT – The PWR key turns the unit on and off and activates
the backlight.
2. PAGES – Pressing the Pages key and the ← → arrow keys switches
the unit between the four different page screens: Satellite Status Page,
Navigation Page, Map Page and Sonar Page.
3. MENU – Press the Menu key to show menus and submenus. This
also accesses search functions for streets, intersections, addresses and
highway exits.
5
4
2
8
7
9
6
3
1
MMC slot access door