Eagle Electronics FISHEASY 240 - Manual (Page 9)

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Auto bottom track: ........Yes.
Zoom bottom track:.......Yes.
Split-screen zoom: .........Yes.
Surface water temp: .....Yes, built into transducer. Optional external
temperature sensor or combo speed/temp
sensor available.
Speed/distance log: .......Yes, with optional speed sensor.
This manual covers the FishEasy 240 and FishEasy 240 Portable. Both
units operate the same way. The only difference between the two is
that the portable unit includes a portable transducer and other items
that enable portable use.
NOTICE!
The storage temperature for your unit is from -4 degrees to +167
degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Extended
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 SOund 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: