1-8 DSM250 Digital Sounder Module
Note: Receiving and displaying position data requires that a GPS is
connected to your Raymarine system.
Figure 1-4: Half-Screen Windows in Sonar Mode
Details on selecting windows are given in Chapter 3.
For details on the radar, chartplotter or fishfinder display, please
refer to the Owner’s Handbook supplied with that unit.
Sonar Options
The DSM250 provides controls to select additional modes:
• Frequency – you can select the transducer frequency: 50 kHz for
wide coverage and deep water, 200 kHz for a detailed view, both
frequencies simultaneously or auto-frequency. The default set-
ting 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 struc-
ture and display 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 dis-
plays the patented Bottom Coverage width indication.
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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