Intermec TRACKER PRO 128 User Manual download pdf (Page 4)

USING THE TRACKER UNIT

HOW SONAR WORKS

Your Tracker unit uses sonar to locate

and define underwater objects, define

the bottom terrain, as well as deter-

mine distance.

Sonar technology is based on sound

waves. Your Tracker unit sends out a

sound wave signal. With this signal it

determines distance by measuring the

time between the transmission of the

sound wave and when the sound

wave is reflected off an object. Your

Tracker uses the reflected signal to

interpret location, size and composi-

tion of an object.

Sonar is very fast. A sound wave can travel from the surface to a depth of

240' (70m) and back again in less than 1/10 of a second. It is unlikely that

your boat can "outrun" this sonar signal.

The Tracker unit is a dual frequency, dual beam unit, and generates two dis-

tinct sonar signals - one narrow, one wide. Each signal is optimized for a

particular purpose. First, the center beam transmits at a frequency of 200

kHz in a 20 degree (narrow) symmetrical pattern for greater depth capa-

bility and excellent detail. Information from this center beam is used to

draw the graphic representation of the bottom on the display.

Second, the wide beam transmits at a frequency of 83 kHz in a 53 degree

(wide) symmetrical pattern for greater area of coverage. Information from

the wide beam is used to accurately detect the presence and location of

fish. A wide beam has a large area of coverage but limited resolution of

detail. A narrow beam has excellent detail, but within a limited area

of coverage.

The combination of the two beams and dual frequencies provides the com-

bination of a large area of coverage and a high level of detail.

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Intermec TRACKER PRO 128 User Manual Page 4