Raymarine DownVision CPT-70, Installation Instructions Manual

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2.2 CHIRP Sonar overview
CHIRP sonar produces a conical shaped beam, the
coverage of the conical beam is the water column
directly beneath the vessel
Conical beam
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Sonar is effective at a range of speeds. In deeper
waters the CHIRP bandwidth is automatically
optimized to improve bottom lock and the detection
of moving objects (e.g. fish) in the wider water
column.
CHIRP sonar screen example
2.3 CHIRP DownVision TM overview
DownVision TM produces a wide–angle side-to-side
beam and a thin fore-to-aft beam. The coverage of
the
DownVision TM beam is a water column directly
beneath and to the sides of the vessel.
DownVision TM beam
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DownVision TM is effective at lower vessel speeds. In
deeper waters the CHIRP bandwidth is automatically
optimized to improve bottom lock and the detection of
moving objects (e.g. fish) in the wider water column.
The wide, thin beam produces clear target returns.
The use of CHIRP processing and a higher operating
frequency provide a more detailed image, making
it easier to identify bottom structures around which
fish may reside.
CHIRP DownVision TM screen example
Document and product information
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