Raymarine DSM300 - Manual (Page 53)

Chapter 4: Basic Display Controls 53
Changing the Sounder Range
By default, the sounder automatically adjusts the display range, selecting the
shallowest range that keeps the bottom in the lower half of the display window.
Shift is disabled (the value is ignored) when auto-range is selected.
Alternatively, the RANGE key lets you select the maximum depth displayed on
the scrolling bottom and A-Scope displays. You can also set the shift value to
move the image window up or down within the current range.
The following range/shift values are available:
Table 4-2: Range and Shift Values
Feet Fathoms Meters
Range Shift Range Shift Range Shift
5 1 1 1 2 1
10 2 2 1 4 1
15 5 3 1 6 2
20 5 4 1 8 2
30 10 5 1 10 2
40 10 8 2 15 5
50 10 10 2 20 5
60 20 15 5 25 5
80 20 20 5 30 10
100 25 25 5 40 10
150 50 30 10 50 10
200 50 40 10 60 20
250 50 50 10 80 20
300 100 60 20 100 25
400 100 80 20 150 50
600 200 100 25 200 50
800 200 150 50 300 100
1000 250 200 50 400 100