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trouble reading the bottom

Old 09-16-2011, 04:12 PM
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Gentlemen, I have a Garmin 4208. The unit does eveything I ask it to except find fish below 100'. I'm up in the NE and in spring I fish cod and haddock 90' down to about 150'. Come fall we have to fish the deeper water, down to 275'. Anyway my problem is this. From 0' to about 100' the unit marks fish well, occasionaly even marking the jigs as they decend. Any fish coming up are marked clearly. When I have to go to deeper water anything below about 100' doesn't mark up. The bottom echo is there but no fish even though we are jigging and hooking up directly below. The bottom is good and finds structure and humps without any problem.I have a 500W tth transducer. I'm pretty sure this problem is operator error but if anyone has suggestions I'm all in. Thanks in advance.
Old 09-16-2011, 04:19 PM
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What is the model number of your transducer?
Old 09-16-2011, 04:27 PM
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Originally Posted by semperfifishing View Post
What is the model number of your transducer?
Havn't a clue and I wont see the boat till Tues.
Old 09-16-2011, 04:29 PM
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I'm going to assume that you also have a GSD22 sounder module.

Regardless, you can make adjustments to the sensitivity and possibly the frequency. Look in your documentation on how to make these adjustments.
Old 09-16-2011, 04:48 PM
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Originally Posted by rwidman View Post
I'm going to assume that you also have a GSD22 sounder module.

.
Thats what I was thinking..so he has plenty of sonar power & adjustments to work with.
Old 09-16-2011, 05:10 PM
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Thank you Gentlemen. I'm not a techie at all but I'll try if I can find the manual.
Old 09-16-2011, 05:23 PM
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Originally Posted by film View Post
Thank you Gentlemen. I'm not a techie at all but I'll try if I can find the manual.
Here you go:

http://static.garmincdn.com/pumac/GP...ries_OM_EN.pdf
Old 09-16-2011, 05:41 PM
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just a thought but did you try zooming in on the bottom?

on my lowrance that works wonders at times.

cheers
Jerry
Old 09-16-2011, 06:29 PM
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Originally Posted by jerrybark View Post
just a thought but did you try zooming in on the bottom?

on my lowrance that works wonders at times.

cheers
Jerry
did the bottom lock with limited sucess. did the zoom and lost the bottom.
Old 09-16-2011, 09:46 PM
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Try manual mode and start adjusting the gain to a higher setting. I can trun the gain up to 100% on mine without hardly any screen clutter.
Old 09-17-2011, 09:11 AM
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Go lower frequency for greater depth.

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