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Eagle SeaFinder 640C DF Fishfinder Manual

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Surface water temp:.....Yes.
Speed/distance log:.......Optional (requires optional speed sensor).
NOTICE!
The storage temperature range for your unit is from -4 degrees to
+167 degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Ex-
tended 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
factory's Customer Service Department. The phone numbers are
listed on the last page.
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 have never owned a sonar fish finder,
this segment will explain the under water basics.
Sonar is an abbreviation for SOund NA
vigation and Ranging, a tech-
nology 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 and 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 con-
verts 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.
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