1.PWR/LIGHT (Power & Light) – The PWR key turns the unit on and off and controls the backlight level.

2.PAGES – Pressing this and the ↑ and ↓ arrow keys switches the unit between the three different page display options. (Full Sonar Chart, Split Zoom Sonar Chart and Digital Data.)

3.MENU – Press this key to show the menus and submenus, which allow you to select a command or adjust a feature.

4.ARROW KEYS – These keys are used to navigate through the menus, make menu selections, move the chart cursor and enter data.

5.ENT (Enter) – This key allows you to save data, accept values or execute menu commands.

6.EXIT – The Exit key lets you return to the previous screen, clear data or clear a menu.

7.ALARM –The Alarm key is a shortcut to access the various sonar alarms. Press this key once to open the Alarms menu.

8.ZOUT – (Zoom Out) – This key lets you zoom the screen out. This key allows you to see the entire water column from surface to bottom.

9.ZIN – (Zoom In) – This key lets you zoom the screen in. This key en- larges fish signals and bottom detail.

Power/lights on and off

To turn on the unit, press PWR. As the unit powers up, the Full Sonar Chart is displayed first.

To turn on the backlight, press PWR again. The unit has three backlight levels to select from. Repeatedly pressing PWR will cycle through the backlight settings and turn off the backlight.

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Eagle Electronics 640c manual Power/lights on and off
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640c specifications

Eagle Electronics has made a significant mark in the world of marine electronics with its innovative and reliable products, notably the Eagle Electronics 640C, 640cDF, and the 640c models. These devices are designed for anglers and navigators who seek advanced functionality combined with user-friendly operation.

The Eagle Electronics 640C is a high-performance fish finder that is primarily admired for its vibrant display and precise mapping capabilities. Equipped with a 640x480 pixel, full-color LCD screen, it provides crystal-clear visibility even in bright sunlight. This device uses advanced sonar technology to offer detailed underwater images, allowing users to locate fish with remarkable accuracy. The high-resolution graphics enhance the experience while providing an intuitive interface for easy navigation through its various features.

The 640cDF, a variant of the 640C, elevates the standard fish finder experience by incorporating dual-frequency sonar capabilities. This model operates on both 200 kHz and 83 kHz frequencies, allowing users to switch between narrow and wide beams based on their fishing needs. The dual-frequency technology provides a more comprehensive view of the underwater environment, making it easier to identify different types of fish and underwater structures. Additionally, the 640cDF boasts temperature sensing capabilities, giving anglers valuable data regarding water conditions that can influence fish behavior.

All models in the Eagle 640 series feature built-in GPS navigation. The integrated GPS provides a reliable mapping system that allows users to mark waypoints and create routes, significantly improving navigation efficiency. This technology is vital for those who engage in long-distance fishing trips or travel in unfamiliar waters. The GPS functionality, combined with the sonar capabilities, makes these devices essential tools for successful fishing excursions.

Furthermore, the Eagle 640 series devices come equipped with customizable display options, allowing users to tailor the information presented based on their preferences. The intuitive menu system simplifies the navigation of the device's various features, empowering users to quickly access critical data without unnecessary complications.

In summary, the Eagle Electronics 640C, 640cDF, and the 640c represent a blend of cutting-edge technology and user-centric design in the marine electronics space. With features such as high-resolution displays, dual-frequency sonar, built-in GPS navigation, and customizable settings, these devices enhance the fishing experience, making them invaluable assets for anglers and navigators alike.
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