Eagle Electronics 640C, 640cDF manual

After you have gained some experience with your sonar, you will want to check out Section 4, which discusses more advanced Sonar Options and Other Features.

When you come to a sonar menu command on the unit's screen, you can look it up in the manual by skimming over the table of contents, just flip- ping through Section 3 or scanning through the sonar options in Section 4.

If you're having difficulty with your sonar, you can find an answer to the most common problems in Section 5, Sonar Troubleshooting.

The manual switches from sonar to navigation in Section 6, which in- troduces you to Basic GPS Operations. This section features a one- page GPS Quick Reference on page 100.

Section 6 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 7, 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, just flipping through Section 6 or scanning through the command portion of Section 7.

This unit is ready to use right out of the box, but you can fine tune and customize it's 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 8, System Setup and GPS Setup Options. Section 8 is organized in alphabetical order.

In Section 9, we go into more detail on one of the unit's most remarkable GPS capabilities — Searching. We'll introduce a search example in the Ba- sic GPS Operation section, but there are so many map items you can search for, we had to give this function it's own section in the manual! For example, did you know this unit can look up business phone numbers, functioning as a virtual Yellow Pages? We’ll show you how in Section 9.

Finally, in Section 10, 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 how much sonar and GPS power your unit contains.

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