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smallest amount of Gain. At this level, the screen
will display little or no data. Higher Gain numbers
will brighten the display. The Gain level required to
see a specific target will vary with target range, wa-
ter clarity and background noise. In addition, Range
changes may also require changes in Gain.
In the Auto Gain mode, PC/180 will adjust the gain
level automatically depending on the strength of the
sonar signal returns. Note that it is still possible to
make manual adjustments in the Auto Gain mode,
but any adjustments you make could be changed by
PC/180.
Range Adjustment
The Range is the maximum distance at which fea-
tures will be displayed by PC/180. In general, fea-
tures at greater distances will be less clearly re-
solved. In addition, the water conditions will help to
determine the greatest distance at which PC/180 can
accurately image features. Click on the Auto box to
turn Auto Range on and off. A check in the box indi-
cates that Auto Range is on. The default setting is
off.
In the manual mode, PC/180 allows you to choose
one of twelve preset Ranges. Range can be varied
between 25 and 1400 feet, 8 and 420 meters, or 4
and 224 fathoms. Select the desired Range by slid-
ing the pointer on the Range bar. The default setting
is the minimum range (25 feet).
In the Auto Range mode, PC/180 will adjust the
Range automatically to keep the bottom within the
center three-quarters of the range scale. If PC/180
cannot find the bottom, it will step through the
Ranges until the bottom is found. It is possible to
make manual adjustments in the Auto Range mode.
TIP
Leave the Gain and Range and/or Alarm
boxes open if you plan to make frequent
manual adjustments. Move a box by
dragging it to a desired position on your
screen.
NOTE
Auto Gain and Auto Range are always
turned off when you exit PcView32.
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