Manual Eagle FishEasy 245 DS Fishfinder (page 7 of 72) (English)

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storage in temperatures higher or lower than specified will damage

the liquid crystal display in your unit. This type of damage is not

covered by the warranty. For more information, contact the fac-

tory's Customer Service Department; phone numbers are inside the

manual's back cover.

How Sonar Works

Sonar has been around since the 1940s, so if you already know how it

works, skip ahead to the next segment on the typographical conventions

used in this manual. But, if you've never owned a sonar fish finder, this

segment will tell you the underwater basics.

Sonar is an abbreviation for SO

und NAvigation and Ranging, a technol-

ogy developed during World War II for tracking enemy submarines. A

sonar consists of a transmitter, transducer, receiver and display. In

simple terms, here's how it finds the bottom, or the fish:

The transmitter emits an electrical impulse, which the transducer con-

verts into a sound wave and sends into the water. (The sound frequency

can't be heard by humans or fish.) The sound wave strikes an object

(fish, structure, bottom) and bounces back to the transducer, which

converts the sound back into an electrical signal.

The receiver amplifies this return signal, or echo, and sends it to the

display, where an image of the object appears on the scrolling sonar

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.

Dual Search Transducer

Your unit is packed with a Dual Search Skimmer Transducer that can

transmit at 83 kHz and 200 kHz.

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Eagle FishEasy 245 DS Fishfinder Manual

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