The sonar's microcomputer is sophisticated, but it can be fooled. It can not distinguish between fish and other suspended objects such as trot- lines, turtles, submerged floats, air bubbles, etc. Individual tree limbs extending outwards from a group of limbs is the hardest object for the Fish I.D. feature to distinguish from fish.

You may see fish symbols on the screen when actually, there are no fish. The reverse is also true. The images on the next page show how Fish I.D. can actually miss fish that are present.

Does that mean Fish I.D. is broken? No. The feature is interpreting so- nar returns in a specific way to help take some of the work out of read- ing the screen. Remember: Fish I.D. is one of the many tools we provide so you can analyze your sonar returns for maximum fish finding infor- mation. This and other features can help you successfully see beneath the boat under varied water and fishing conditions. So, practice with the unit in both the Fish I.D. mode and without to become more famil- iar with the feature. The default setting for Fish I.D. is off.

Sonar Features menu with Fish I.D. Symbols turned on.

To turn on the Fish I.D. feature:

1.From the Sonar Page, press MENU↓ to SONAR FEATURESENT.

2.Press → to FISH SYMBOLSENTEXITEXIT.

To turn off Fish I.D., repeat these instructions.

FishTrack

The FishTrack feature shows the depth of a fish symbol when it ap- pears on the display. This lets you accurately gauge the depth of tar- gets. This feature is available only when the Fish I.D. feature is on. The default setting for FishTrack is off.

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Eagle Electronics 640C, 640cDF manual FishTrack, To turn on the Fish I.D. feature
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640c, 640C, 640cDF 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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