Raymarine DSM300 - Manual (Page 57)

Chapter 4: Basic Display Controls 57
Figure 4-8: Bottom Lock Display with Split Windows
➤
To reposition the bottom lock image:
1. Use the trackpad to move the cursor to the bottom image until the text BL is
displayed near the cursor.
2. Press ENTER, a horizontal line appears, indicating the cursor is active. Use the
trackpad to move the line to the desired bottom lock image position.
3. Press ENTER to reposition the bottom lock image, or CLEAR to cancel the
operation.
Using A-Scope
The scrolling bottom display provides a historical record of sonar echoes. Use the
A-Scope screen to show raw sonar data directly from the transducer beam. This
gives you a “real time” image of fish and bottom structure directly below the
transducer. This function is very useful in showing the strength of the echo
returned from a fish. At the lower end of the window, A-Scope also displays the
patented Bottom Coverage width indication.
D6186-1
ZOOM FREQUENCY BTM.LOCK A-SCOPE
AUTO GC Z H 200kHz
10
20
30
80 80
0
20
40
60
ft
0
BL
BL