Raymarine DSM300 - Manual (Page 19)

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.
ZOOM FREQUENCY BTM.LOCK A-SCOPE
AUTO GCRZFH 50kHz
0
60
STEER PORT
WAYPOINT 001
XTE
WPT BRG
WPT RNG
TTG
0.28 nm
26.8 nm
03 h :59 m
351° T
20
40
ZOOM FREQUENCY BTM.LOCK A-SCOPE
AUTO GC FH 50kHz
0
DEPTH
ft
SPEED
kts
20.1
15.1
10.1
F
30 0 MINUTES
20
40
TEMPERATURE
ft
60 60
Horizontal Half-Screen
D6206-1
Vertical Half-Screen