Thread: Sonar Quiz #41

Originally Posted by BobB

I think it is prop wash ..... which is surface disturbance. It looks like it goes deeper on the Si because the SI picks it up far off to the side ... and the only thing the transducer knows is how far something is from the tranducer, and the display shows it lower in the water column than it actually is.

This is a good explaination of why the prop wash "seems" to show "deeper" in the water column ...when in actuality the prop wash is being plotted as simply "farther away from the xducer" ...

Isn't it possible that because the DI fan beam and the 2d cone beam are very narrow at the xducer and spreads out as it decends downward ...that the prop wash (being close to the surface) is simply not in the reaches of the DI fan beam or the 2d cone beam ...??



Rickie