Raymarine CP450C, Installation Instructions Manual

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Broadband sonar technology
The CP450C uses broadband sonar technology.
Traditional sounders use a single carrier frequency or carrier wave
for the sonar ping. These sounders work by measuring the time it
takes the ping echo to return to the transducer to determine target
depth. Using this method if 2 targets are close together they are
shown as a single large target, rather than multiple smaller targets.
By using a broadband swept frequency ’CHIRP’ the signal can
distinguish between multiple close targets which enables the
sounder to display multiple targets instead of large combined
targets.
Some of the benefits are improved:
• target resolution.
• bottom detection even through bait balls and thermoclines.
• detection sensitivity.
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D 12223-1
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Traditional sounder Broadband CHIRP sounder
10 CP450C