Quote Originally Posted by MonteSS View Post
Not sure. It uses the "chirp"

....Bill
I have been reading on the topic of CHIRP...(most of it is way over my head)...

I do understand that CHIRP uses a "frequency range" instead of a "tone pulse" that most sonar utilizes...

I did find possible frequency ranges and beam angles here...
RAYMARINE Announces DragonFly - Moderated Discussion Areas

The SONAR is said to have chirp technology. The device employs two ranges of frequencies. A range of 320-kHz to 380-kHz is used, as well as a range from 170-kHz to 230-kHz. The SONAR signals are conducted via a new Raymarine transducer, the CPT-60. The transducer is said to have dual characteristics. The higher frequency transducer is described as providing a "fan beam" of dimensions 1.4-degrees by 60-degrees. The lower frequency transducer is said to provide a conical beam of 25-degrees. In combination the two signals, the two transducers, and the chirp signal processing are said to deliver a clear, life-like image of the bottom and its structure. Raymarine refers to these features as ClearPulse and DownVision.

Further down in that same thread ... It seems that NAVICO has filed patent infringement against RAYMARINE for the introduction of Dragonfly...(sounds ghostly familiar to another patent infringement case not that long ago of HB filing against NAVICO... Interesting...)

I'll be watching that thread...

Rickie