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Old 02-09-2010, 03:20 PM   #1
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Ruby Red Lip
 
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Default Fish Finder Readings?

Whenever I get into really shallow water, 2-3ft, my fishfinder wants to read erratically. It will display anywhere from 2ft to 189 ft up and down. Anyone have any suggestions or have you experienced the same problems?
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Old 02-09-2010, 03:45 PM   #2
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Snapper
 
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Default RE: Fish Finder Readings?

It might help if we knew what fish finder you have. Also, where do you have it mounted? I am thinking it may be in a bad place (at least for shallow water) i.e. too close to the motor and the only time you have a problem is when you get into shallow area from the prop wash.
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Old 02-09-2010, 03:49 PM   #3
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Default RE: Fish Finder Readings?

Every fish finder I have ever had always done this, some vary from 2' to a 1' before they show the wrong reading.
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Old 02-09-2010, 08:00 PM   #4
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Default RE: Fish Finder Readings?

try swapping the frequency, 50 to 200 or vise versa. can't remember.
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Old 02-09-2010, 08:13 PM   #5
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Default RE: Fish Finder Readings?

Use the higher frequency in shallow water. Mine does the same thing when i get into water that is less than about4 feet.
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Old 02-09-2010, 08:55 PM   #6
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Default RE: Fish Finder Readings?

thats how every fishfinder ive had is too....you want 200hz in up to like 200-250ft and 50hz out deeper
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Old 02-10-2010, 09:26 AM   #7
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Default RE: Fish Finder Readings?

<P class=MsoNormal style="MARGIN: 0in 0in 0pt">Use the higher frequency (200khz) in shallow water and the lower frequency (50khz) for deep water. Single frequency transducers work best in shallow water.
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Old 02-11-2010, 12:15 PM   #8
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Default RE: Fish Finder Readings?

Pretty sure they all do that because of a double echo of the sound bouncing off the bottom of the water, then the bottom off the boat, then the bottom of the water again.
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Old 02-11-2010, 10:40 PM   #9
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Default RE: Fish Finder Readings?

Turn the gain down. Mine (Simrad) will even go to negative numbers
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Old 02-14-2010, 08:14 AM   #10
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Ruby Red Lip
 
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Default RE: Fish Finder Readings?

I have a Humminbird 717, and thanks guys for all the input. Frequency and gain may be my problems. I'll give them both a try..
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