54 DSM300 Operation with PLUS Series Displays
1
Depths greater than 3000 ft (1000 m) require a high performance transducer
➤ To adjust the range and shift values:
1. Press
RANGE, this sets adjustment to manual and the range soft keys are dis-
played. The range adjusts up or down depending on the direction pressed.
2. Use the
RANGE key to adjust the range: press the up arrow to select a shal-
lower range, press the down arrow to select a deeper range.
3. If desired, press the RANGE AUTO MAN soft key to select AUTO range.
AUTO range is indicated by the letter R in the status bar.
4. To adjust the shift, press the appropriate SHIFT soft key: use the up soft key to
select a shallower shift, use the down soft key to select a deeper shift. The
image window is shifted up by the selected amount. Pressing the SHIFT keys
sets the range to MANUAL.
5. Press
ENTER to return to the default display.
Selecting the Frequency
The DSM300 uses dual frequency sonar—50 kHz and 200 kHz—and can be used
in either auto or manual modes.
The DSM300 can automatically select the appropriate frequency, based on the
current display range. As the depth increases while in Auto Frequency mode, the
sounder module shifts from 200 kHz to 50 kHz at 250 ft (80 m). As the depth
decreases, the sounder module switches from 50 kHz to 200 kHz at 150 ft (50 m).
The Auto Frequency setting is also useful for automatically searching for bottom.
1500 500 250 50 500 100
2000 500 300 100 600 200
2500 500 400 100 800 200
3000 1000 500 100 1000 250
1
3500
875 600 150 1200 300
4000 1000 700 175 1400 350
4500 1500 750 250 1500 500
5000 1250 850 170 1700 425
Table 4-2: Range and Shift Values
Feet Fathoms Meters
RANGE
RANGE
AUTO MAN
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