Remember, the unit must have a clear view of the satellites in order to receive their signals. Unlike radio or television signals, GPS works at very high frequencies. These signals can be easily blocked by trees, buildings, an automobile roof, even your body.

Like most GPS receivers, this unit does not have a compass or any other navigation aid built inside. It relies solely on the signals from the satellites to calculate a position. Speed, direction of travel and distance are all calculated from position information. Therefore, in order for unit to determine direction of travel, you must be moving and the faster, the better. This is not to say that it won’t work at walking or trolling speeds — it will. There will be more wandering of the data shown on the display.

GPS alone is accurate for route navigation, but the U.S. Federal Avia- tion Administration has special aircraft navigation needs that go be- yond basic GPS. Consequently, the FAA has developed a program to boost GPS performance with its Wide Area Augmentation System (WAAS). The FAA commissioned the system on July 11, 2003.

WAAS is designed to increase GPS accuracy to within 7.6 meters verti- cally and horizontally, but according to the FAA, it consistently comes within 1-2 meters horizontally and 2-3 meters vertically. It does this by broadcasting correction signals on GPS frequencies. Your unit auto- matically receives both GPS and WAAS signals.

There are, however, some fringe areas of the U.S., including parts of Alaska, that do not yet receive robust WAAS coverage. Continued WAAS development is planned to extend WAAS coverage in the years to come.

WAAS boosts the accuracy of land GPS navigation, but the system is designed for aircraft. The satellites are in a fixed orbit around the Equator, so they appear very low in the sky to someone on the ground

in North America. Aircraft and vessels on open water can get consis- tently good WAAS reception, but terrain, foliage or even large man- made structures can sometimes block the WAAS signal from ground receivers.

You'll find that using your GPS receiver is both easy and amazingly accurate. It’s easily the most accurate method of electronic navigation available to the general public today. Remember that this receiver is only a tool. Always have another method of navigation available, such as a map or chart and a compass.

Also remember that this unit will always show navigation information in the shortest line from your present position to a waypoint, regardless

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Eagle Electronics 642cDF manual
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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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