Lowrance LCX-18C, Operation Instructions Manual

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5
Audible alarms: ............. Arrival/off-course/anchor.
Graphic symbols for
waypoints or event
marker icons:
................. 42.
Routes: ............................. 100; up to 100 waypoints per route.
Plot Trails: ...................... 10 savable; up to 9,999 points per trail.
Zoom range: .................... 37 ranges; 0.05 to 4,000 miles.
NOTE:
The above memory capacities refer only to the unit's on-board mem-
ory. The amount of GPS or sonar data you can record and save for
recall later is only limited by the number of MMC cards you have.
NOTICE!
The storage and operation temperature range for your unit is from -4
degrees to +167 degrees Fahrenheit (-20 degrees to +75 degrees Cel-
sius).
Extended storage or operation 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; phone numbers are
listed on the last page.
How Your Sonar Works
Sonar has been around since the 1940s, so if you already know how it
works, skip down to read about the relatively new technology of GPS.
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.
(Lowrance developed the world's
first transistorized sportfishing sonar in
1957.) A sonar consists of a transmitter, transducer, receiver and dis-
play. 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.