Chirp Sonar Overview; Chirp Downvision Tm Overview - Raymarine DownVision CPT-70 Installation Instructions Manual

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
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
Document and product information
2.3 CHIRP DownVision
DownVision TM
beam and a thin fore-to-aft beam. The coverage of
the DownVision
beneath and to the sides of the vessel.
DownVision TM
DownVision TM is effective at lower vessel speeds. In
D12784-2
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 overview
produces a wide–angle side-to-side
TM beam is a water column directly
beam
TM screen example
D12777-2
11