chart. The sonar's microprocessor calculates the time lapse between the transmitted signal and echo return to determine the distance to the object. The whole process repeats itself several times each second.

Your unit can record a log of the sonar signals that scroll across the screen and save them to the MMC memory card. (These recordings are also called sonar charts or sonar graphs.) You can replay this sonar log in the unit using the Sonar Simulator function, or play it back on a per- sonal computer using our free Sonar Viewer or product emulator. The viewer and emulator are available for download from the Eagle web site, www.eaglesonar.com.

You can save several different sonar log files, erase 'em and record new ones, over and over again. The size of your sonar recordings is only limited by the free space available on your MMC.

How GPS Works

You'll navigate faster and easier if you understand how the unit scans the sky to tell you where you are on the earth – and where you're going. (But if you already have a working understanding of GPS receivers and the GPS navigation system, skip on ahead to Section 2, Installation & Accessories on page 13. If you're new to GPS, read on.

Think of your unit as a small but powerful computer. The unit includes a keypad and a screen with menus so you can tell it what to do. The screen also lets the unit show your location on a moving map, as well as point the way to your destination.

This gimbal-mounted unit uses an internal antenna and receiver, which makes the system work like your car radio. But instead of your favorite dance tunes, this receiver tunes in to a couple of dozen GPS satellites circling the earth. (It will also listen to WAAS satellites in orbit, but we will delve into that in the segment introducing you to GPS and WAAS.)

Your unit listens to signals from as many satellites as it can see above the horizon, eliminates the weakest signals, then computes its location in relation to those satellites. Once the unit figures its latitude and lon- gitude, it plots that position on the moving map shown on the screen. The whole process takes place several times a second!

The performance doesn't stop there. Stored in the permanent memory of each unit is a basic background map of the entire world. We lock it in here at the factory — you can not change or erase this map. The background map is suitable for many navigation chores, but for maximum accuracy and much more detail, you need our optional map-

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Eagle Electronics 642cDF manual How GPS Works
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642c, 642cDF specifications

Eagle Electronics has made significant strides in the world of electronics with its flagship models, the 642cDF and 642c. These devices are tailored for enthusiasts and professionals alike, offering a combination of advanced technology, user-centric design, and robust performance.

One of the standout features of the Eagle Electronics 642cDF is its high-definition display. The device boasts a vivid color screen that enhances visibility and improves user interaction, making it easier for users to navigate through various functions and settings, even in bright sunlight. The display is also designed for durability, resisting scratches and damage from regular use.

Both the 642cDF and 642c come equipped with advanced GPS capabilities, ensuring precise navigation and location tracking. This feature is crucial for outdoor activities such as hiking, boating, and off-roading. The built-in mapping software includes a vast array of preloaded topographic maps, providing users with essential information about terrain, elevation, and points of interest.

In terms of connectivity, these models excel with Bluetooth and Wi-Fi capabilities. This allows users to seamlessly connect to other devices and share data without hassle. Whether it’s syncing with a smartphone or sharing navigation data with another device, the wireless options enhance the user experience significantly.

The design of the 642cDF and 642c is also notable. Ergonomically shaped, these devices fit comfortably in hand, and the layout of buttons and controls is intuitive and user-friendly. This attention to ergonomics makes prolonged use more comfortable and reduces the likelihood of user error.

Eagle Electronics has prioritized durability in its products. Both models are water-resistant and built to withstand harsh environmental conditions, making them ideal for outdoor enthusiasts who require reliable technology. The rugged construction means users can depend on them in any situation, whether they are sailing through rain or trekking across muddy trails.

Battery life is another key characteristic. The 642cDF and 642c have been engineered to provide extended usage on a single charge, allowing users to rely on their devices during long excursions without worrying about power depletion.

In conclusion, the Eagle Electronics 642cDF and 642c stand out as top-tier electronic devices in their category. With features such as a high-definition display, advanced GPS capabilities, robust connectivity, ergonomic design, durability, and impressive battery life, they are well-suited for both casual users and professionals seeking reliable and advanced electronic solutions for their activities. As technology continues to evolve, these machines remain at the forefront, proving their worth in the ever-competitive electronics market.
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