2
dex, or just flipping through Section 3 or scanning through the sonar op-
tions in Section 4.
Section 5 is a brief introduction to the powerful ice fishing applications of
the M68C and M68C IceMachine. (See section 2 to learn how you can get
the most out of your M68C with the addition of a special portable power
pack for ice fishing.)
If you're having difficulty with your sonar, you can find an answer to
the most common problems in Section 6, Sonar Troubleshooting.
The manual switches from sonar to navigation in Section 7, which in-
troduces you to Basic GPS Operations. This section features a one-
page GPS Quick Reference on page 91.
Section 7 contains short, easy-to-scan GPS lessons that follow one an-
other in chronological order. They're all you'll need to know to find your
way on the water quickly.
After you've learned the basics (or if you already have some GPS expe-
rience), you may want to try out some of the unit's many advanced
navigation features. That brings us to Section 8, Advanced GPS Opera-
tions. This section contains the rest of the unit's GPS command func-
tions, organized in alphabetical order.
When you come to a GPS menu command on the screen, you can look it up
in the manual by skimming over the table of contents or index, just flipping
through Section 7 or scanning through the command portion of Section 8.
This unit is ready to use right out of the box, but you can fine tune and
customize its operation with dozens of options. Since sonar is the unit's
key feature, we put the main sonar options in Section 4. Some options,
such as screen brightness settings, affect both sonar and GPS opera-
tions. We describe how to use those common options along with GPS
options in Section 9, System Setup and GPS Setup Options. Section 9 is
organized in alphabetical order.
In Section 10, we go into more detail on one of the unit's most remarkable
GPS capabilities — Searching. There are so many map items you can
search for, we had to give this function its own section in the manual!
Finally, in Section 11, we offer Supplemental Material, including a list
of the GPS datums used, warranties and customer service information.
Now, if you're into the fine details, glance over the next segment on
specifications to see just how much sonar and GPS power your unit con-
tains. It's important to us (and our power users), but, if you don't care
how many watts of power the unit has, or how many waypoints it can
store, skip ahead to important information on how sonar works, on page
4. (Background on GPS begins on page 5.)
