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Section 3: Basic Sonar Operation
This section addresses the unit's basic sonar operations. The instruc-
tions in Sec. 3 are in chronological order. Sec. 4, Sonar Options & Other
Features, will discuss more advanced functions and utilities.
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 49.
Keyboard
LMS-339cDF iGPS sonar unit showing map with sonar split screen,
keyboard and access door for the MMC slot.
1. PWR/LIGHT – The PWR key turns the unit on and off and activates
the backlight.
2. PAGES – The Pages key helps switch the unit between four page
screens: Satellite Status Page, Navigation Page, Map Page and Sonar
Page.
3. MENU – The Menu key is used to show menus and submenus. It
also gives access to search functions for streets, intersections, addresses
and highway exits.
5
4
2
8
7
9
6
3
1
MMC slot access door