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jeremyj 08-10-2013 03:37 PM

losing return on garmin depthfinder
I'm running a garmin 3210 with a P79 shoot thru transducer.

The bottom return is pretty good at 200KHz, but gets choppy when running on 50KHz at around 25mph.

Are my expectations too high for this setup?

semperfifishing 08-10-2013 04:58 PM

That is about as good generally as you would expect to get with that set up.

jeremyj 08-10-2013 07:34 PM

Thanks for the feedback.

What transducer would you recommend? I'm running a catamaran, so I'd rather not put in a thru hull. I'm using a GSD22

I'd like to be able to use 50KHz (looking for hard bottom) while running 25-32 mph.

semperfifishing 08-10-2013 07:58 PM

If you are good as is with 200 khz then that seems more than adequate considering yo are using a single element 600 watt P79.

And if you don't want a thru hull them you are limited either a 8 element 1 kw M260 in hull or the 1 kw transom mounted units.

Here are a few interesting videos.

50 & 200 kHz B164

200 kHz Tm260

JohnFleay 08-10-2013 08:09 PM

I doubt it will improve much at 50 kHz regardless of transducer, in fact, my experience has been that the more powerful and more sensitive the transducer, the more noise they oick up at speed and hence worse reading.

My B744 (same single element as P79) holds bottom perfectly with 200 kHz at 40 MPH, where as the 50 kHz breaks up a bit. I have the 7 element SS264 50kHz als installed, and it breaks up even more at speed, breaking up badly at over 25 MPH. Although the flush mount SS264 is not as good as the performance fairing mounted B744, I think the increased sensitivity results in it being more affected by turbulence.

From people I have spoken to, CHIRP transducers are even more affected at speed, requiring the best mounting (read performance fairing) you can get.

I doubt you will impove 50 kHz performance at speed.

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