Chapter 2: Getting Started 19
Figure 2-3: Half-Screen Windows in Sonar Mode
Details on selecting windows are given in Chapter 4. For details on the radar,
chartplotter or fishfinder display, please refer to the Owner’s Handbook supplied
with that unit.
Sonar Options
The DSM300 provides controls to select additional modes:
• Frequency – you can select the transducer frequency: 50 kHz for wide cover-
age and deep water, 200 kHz for a detailed view, both frequencies simulta-
neously or auto-frequency. The default setting is auto-frequency, which
determines the optimum frequency of operation based on the current depth.
• Bottom Lock – changes the operating mode to re-set the bottom. It provides a
bottom-up view: the bottom is used as the reference, its image is flattened
and depths are displayed here.
Bottom lock mode is used primarily to filter out the bottom structure and dis-
play fish details only.
• A-Scope – displays a real-time image of the bottom structure and fish directly
below the transducer. The A-Scope window also displays the patented Bot-
tom Coverage width indication.
• Zoom – enlarges all or part of the bottom graph display. You can select x2, x4,
or x6 magnification and the zoom area can be automatically or manually
adjusted.
ZOOMFREQUENCY
BTM.LOCK A-SCOPE
AUTO GCRZFH
50kHz
0
60
STEER PORT
WAYPOINT 001
XTE
WPT BRG
WPT RNG
TTG
0.28nm
26.8nm
03
h:59m
351°T
20
40
ZOOMFREQUENCY
BTM.LOCK A-SCOPE
AUTO GC FH
50kHz
0
DEPTH
ft
SPEED
kts
20.1
15.1
10.1
F
30 0MINUTES
20
40
TEMPERATURE
ft
60
60
Horizontal Half-Screen
D6206-1
Vertical Half-Screen
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