Using A-Scope - Raymarine DSM250 Owner's Handbook Manual

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BL

Using A-Scope

200kHz
AUTO GC Z H
BL
FREQUENCY ZOOM
Figure 5-8: 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.
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 func-
tion is very useful in showing the strength of the echo returned
from a fish. At the lower end of the window, A-Scope also dis-
plays the patented Bottom Coverage width indication.
30
20
20
40
10
0
60
ft
BTM.LOCK A-SCOPE
DSM250 Digital Sounder Module
0
80
80
D6186-1