furuno FVC581 or Garmin GSD20

[Endless Summer]

I have and older FVC 581 sounder that came off the boat but I left the thru hull transducer on.

I replaced the FVC581 with a Garmin 2006C chartplotter and added the GSD20 for a sounder. Also I mounted a trailer mount transducer on the far right side on the transome. I did this because the trim tabs cover the entire area.

I was thinking of putting the FVC581 back on to see if it works better than the GSD20.

The GSD20 works ok but I get a lot of turbulence because of where the transducer is mounted.

The other option is to replace the FVC581 transducer with a transducer for the GSD20.

Opinions please.

[DOGHOUSE26]

Regardless of the sounder, you won't get a decent view unless the transducer is forward close to the center of the boat. Garmin makes a great GPS, the sounder I'm not sure of. You can't beat Furuno but your 581 puts you back in the days of jackpoling tuna, no nets. I had a 582 and loved it, maybe more than the 585 I have now.

[hijole]

It seems that whatever you get it's rock cod you will be looking for the deepest .

[NoSlack]

I have the 582L with a thru hull xducer mounted center line in front of the engine. Reads great to 17 or 18 knots then it starts washing out.

Mike

[Roper1]

Airmar makes top of the line transducers. To get good readings at high speed you definitely need a thru hull with high speed fairing. If you have a dual freq sounder, they have a single transducers that allows you to look at both freq simultaneously if sounder has capability. A little pricey but worth it.
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[Endless Summer]

Thanks for the info.

I reinstalled the 581 and used it this past weekend. The transducer mummed and the screen would freeze up. I think its time to replace the transducer with a thru hull for the GSD20 it would work better placed in front of the motor.