Intermec TRACKER PRO 128 User Manual download pdf (Page 7)

depth of the water changes, the range

changes as necessary in order to retain a

bottom representation on-screen.

When in Auto mode, the horizontal line

at the top of the screen is the “zero

line,” representing the surface of the

water. Occasionally there is a gap in this

line. This gap indicates the unit is up-

dating the display even if the bottom is

not visible on-screen, or if the bottom

information is not changing.

New sonar information appears on the

right side of the graphic area of the dis-

play and moves to the left as new infor-

mation is displayed. The Tracker unit

automatically selects the appropriate

depth range to show the depth of water beneath the transducer. This

range is selected so the bottom representation is typically shown about 2/3

down the display.

Bottom. The graphic depiction of the

bottom provides an effective tool for

understanding the composition of the

bottom. If the bottom is hard and

smooth, the bottom depiction is narrow

and dense. If the bottom is soft mud or

sand, the depiction will be thick and less

dense. This indicates much of the signal

is absorbed by the soft bottom. If the

bottom is rocky or rugged in composi-

tion, the depiction is of varying density

and textured in appearance.

Wave action also affects the bottom

depiction. The information drawn is a

distance measurement, so if the boat is

USING THE TRACKER UNIT

WHAT YOU SEE ON-SCREEN

Water Depth

Bottom Depiction

Depth Range

Figure B

Zero Line

Surface Clutter Rocky Bottom

Soft Bottom Hard Bottom

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Intermec TRACKER PRO 128 User Manual Page 7