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Discussion Starter #1
Hey guys,

I have the Garmin 4210 on my boat and I noticed in 175' and deeper my sonar loses it's fish definition. I know there are fish there as everyone is catching them but nothing shows up on the sonar. I can see a decent bottom line but nothing in the water column. I have the GSD22 with a 600w transducer. Should I upgrade to the GDS24 or go with a more powerful transducer?

Thanks for your help
 

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I had a GSD22 which I upgraded to a GSD24 - big difference in the sonar. The GSD-24 provided much greater clarity and target discrimination than did the GSD-22, and held bottom better. I upgraded to a M260 (1000w shoot thru) transducer as well shortly after adding the GSD-24 which again was a big step up in performance. How you have the 600w transducer mounted (if it's done right or not) will impact what you get out of it, and the depth of the water you fish would be the deciding point on whether you need to or not - if you fish <150' most of the time, the 600w is probably ok, but if you fish 300'+, you will benefit from the 1000w ducer. One thing to remember is that you need to check the cone angle of whatever ducer you end up with as many of the 1000w transducers can have narrow cone angles which means in shallow water you are not displaying much bottom (M260 has 6 degree 200hz and 19 degree 50hz cone angles).
 

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I have a 4208 GSD 22 and Airmar p66. Something is broke with it and I just ordered a new transducer. I never had issues with definition. What hz are u using it at? isnt 200 feet the time to switch to 50hz instead of 200hz?
 

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Discussion Starter #6
I fish in water from 100' to 300'. I have a bronze through the hull transducer. Not sure the brand as it was on the boat when I bought it. I was told it was a 600w. It does great in shallow water but from 175' and up not so good
 

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The GSD 24 is a huge upgrade over the GSD 22. However, the transducer is critical and shouldn't be overlooked. Make sure you have the proper power transducer, proper cone width you're looking for at target depths, correct angle, and you have clean (undisturbed) water over the face of your transducer. You shouldn't need to use anything other than 200kHz in 300' of water. I have no need to switch to 50kHz until I'm in 600'+.
 

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Discussion Starter #8
The transducer is a Garmin B60 600w thru-hull. I assume this is a low end transducer. If so what should I upgrade too?
 

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The GSD 24 is a huge upgrade over the GSD 22. However, the transducer is critical and shouldn't be overlooked. Make sure you have the proper power transducer, proper cone width you're looking for at target depths, correct angle, and you have clean (undisturbed) water over the face of your transducer. You shouldn't need to use anything other than 200kHz in 300' of water. I have no need to switch to 50kHz until I'm in 600'+.
This is very similar to how I use my FF. The only time I use 50kHZ in shallow water is to get a broader picture of the bottom because of the M260 narrow cone angle at 200 - 98% of the time, it stays on 200.
 

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I had a B60 before and I am not sure it I have a GSD-22 or 24 but with a B60, I had no problems seeing fish at the depths you are talking about. I am inclined to think you have a setting out of whack or something else going on.
 

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Discussion Starter #11
Thanks for all the input. I have adjusted the settings many time, a few times while I was on the phone with Garmin support with little or no success. Garmin has told me to upgrade to the GSD 24 sonar.

I'm told the sonars are about 700 bucks. Who said fishing was cheap!
 
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