When in Auto mode, the horizontal

Surface Clutter Rocky Bottom

Soft Bottom Hard Bottom

USING THE 105SX

WHAT YOU SEE ON-SCREEN

Bottom Depiction

Zero Line

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 updating 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 display and moves to the left as

new information is displayed. The

105SX automatically selects the

Water Depth

Depth Range

appropriate depth range to show

the depth of water beneath the

transducer. This range is selected so

Figure B

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 composition, 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 moving up and down over flat bottom, the bottom depiction often appears in regular variations that match wave timing.