Raymarine DSM250, Owner'S Handbook Manual

Page: 84 / 122

5-24 DSM250 Digital Sounder Module
Figure 5-9: The Three Modes of A-Scope
Using Zoom
Zoom enlarges all or part of the scrolling bottom display. You can
select automatic zoom so the sounder keeps the bottom in the
lower half of the display window. Alternatively, you can manually
pick the area to be zoomed.
➤
To select Zoom:
1. Press the
ZOOM
soft key.
2. Press the
ZOOM ON OFF
soft key to toggle zoom on.
3. Press the
ZOOM FULL SPLT
soft key to toggle between a full win-
dow zoom image or split windows.
If you select split windows, the display is split vertically, with the
zoom image in the left hand window and the scrolling bottom dis-
play in the right hand window. See
Figure 5-10 .
In a split window display, a vertical Zoom Range Bar appears
(along the right hand edge of the scrolling bottom image) that
marks the range being displayed in the zoom window. This bar
varies in height with the selected zoom level. The depths of the
upper and lower boundaries of the Zoom Range Bar are dis-
played in the upper and lower right corners of the Zoom window.
0
50
25
75
ZOOM FREQUENCY
AUTO G Z
50kHz
BTM.LOCK A-SCOPE
52.3
A-SCOPE
52.3
A-SCOPE
52.3
100
100
A-SCOPE Mode 1 Mode 2
Mode 3
D6189-1
ZOOM
ZOOM
FULL SPLT