Selecting The Frequency - Raymarine DSM300 User Manual

54
Table 4-2: Range and Shift Values
Feet
1500
2000
2500
3000
1
3500
4000
4500
5000
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.
RANGE
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.
Fathoms
500 250
500 300
500 400
1000 500
875 600
1000 700
1500 750
1250 850
DSM300 Operation with PLUS Series Displays
Meters
50 500
100 600
100 800
100 1000
150 1200
175 1400
250 1500
170 1700
100
200
200
250
300
350
500
425