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Chapter 3: System Setup
you have assigned for Depth Units in the setup parameters of the display unit:
meters, fathoms, or feet.
Speed Calibrate
If the transducer is equipped with a speed paddle wheel, the DSM300 calculates
the speed of the boat through the water. The speed calibrate option enables you
to adjust the displayed speed so that it matches your actual speed through the
water. You can adjust the displayed speed from 1% to 200%.
If the sounder reading is too low, set Speed Calibration to more than 100%. If the
sounder reading is too high, set Speed Calibration to less than 100%.
Temperature Calibrate
If the transducer is equipped with a thermistor, the DSM300 calculates the
temperature of the water. The temperature calibrate option enables you to adjust
the displayed temperature. You can adjust the displayed temperature by –9.0°F to
+9.0°F.
Sonar History
Sonar History determines the number of data sample columns that appear on the
screen at one time. The options are: SMALL, which displays 240 columns of data
or LARGE, which shows 480 columns.
Information displayed in a single column using the LARGE setting would occupy
two columns with SMALL. As a result, twice as much data history is displayed
under the LARGE setting. Data displayed using SMALL appears wider and scrolls
across the screen faster.
Sonar Interference Rejection
Two or more sonar-equipped boats operating within range of each other can
create interference on the sounder screen. This usually appears as vertical streaks
in the water that do not represent actual targets.
The DSM300 includes a SONAR INT REJ option that can reduce such interference,
either manually or automatically. LOW rejects only a small amount of the
extraneous objects. Use this setting when you want to be sure that what has been
removed are really false returns.
HIGH cleans up much more interference but can degrade the appearance of
actual targets. AUTOMATIC selects the best rejection level for you.
The default setting is AUTOMATIC.
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