Insignia 105SX manual When in Auto mode, the horizontal

Surface Clutter Rocky Bottom

Soft Bottom Hard Bottom

USING THE 105SX

WHAT YOU SEE ON-SCREEN

When in Auto mode, the horizontal		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.

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