Manual Lowrance LMS-320 (page 13 of 204) (English)

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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 LMS-320's on-board

memory. 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 temperature range for your unit is from -4 degrees to +167

degrees Fahrenheit (-20 degrees to +75 degrees Celsius). Extended stor-

age in temperatures higher or lower than specified will damage the liq-

uid 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 LMS-320 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 under water basics.

Sonar is an abbreviation for SOund NA

vigation 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.

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Lowrance LMS-320 Manual

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