Raymarine DSM25 Owner's Handbook Manual page 35

Chapter 3: Using the Sounder Module
200 kHz
Btm Lock
49 8
BOTTOM LOCK
BOTTOM LOCK
ON SPLIT OFF
ON SPLIT OFF
Note: If the A-Scope or Zoom image was displayed, selecting Bottom Lock automatically
switches OFF A-Scope and Zoom.
To display or remove the Bottom Lock image:
1. Press BOTTOM LOCK. The Bottom Lock soft keys are displayed.
2. Toggle to:
• BOTTOM LOCK ON to replace the standard fishfinder image with the bot-
• BOTTOM LOCK SPLIT to display both the standard fishfinder and bottom
• BOTTOM LOCK OFF to return to the standard fishfinder image.
3. To adjust the range of the Bottom Lock image, press B-LOCK RANGE and then
use the rotary knob to adjust the range.
4. To re-position the Bottom Lock image to view more bottom details, press BOT-
TOM SHIFT and then use the rotary knob to adjust the shift between the bot-
tom of the window (0%) and the middle of the window (50%).
5. Press CANCEL or ENTER to return to the default display.
ft
B-LOCK RANGE
B-LOCK RANGE
30ft
30ft
tom lock image.
lock image in a single window.
30
20
10
0
BOTTOM SHIFT
BOTTOM SHIFT
20%
20%
35
0
20
40
60