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What You See On-Screen
Your 400TX uses a 160 x 160 matrix FSTN LCD
display. This display provides outstanding viewability
in all light conditions over a wide range of
temperatures.
At initial power-up, the 400TX uses settings that were
set at the factory. After initial use, the 400TX will
remember the settings you enter.
There are several elements on-screen that are
common to all modes of operation.
Temperature/Speed. The initial screen layout takes one of two basic forms depending on whether
the optional Temp/Speed accessory is installed. Figure A shows the default view when the
Temp/Speed accessory is installed. Figure B shows the default view when the Temp/Speed
accessory is not installed.
Depth. The digital depth number shows the water
depth directly beneath the transducer location.
Depth Range. The depth range is shown to the right
of the screen. The upper number is 0 indicating the
surface of the water. The lower number is one of the
nine depth ranges available that best match the depth
of the water. As the 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 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 400TX
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
the user with an effective tool for understanding the
composition of the bottom. The FSTN type display
uses 4 discrete levels of gray to indicate the intensity
of the returned sonar signal. The 400TX can display
even the smallest sonar returns with light gray pixels.
Larger returns are displayed with darker shades of
gray. 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 that 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.