FCV 1100 incorrect depth

A

Anonymous

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My 1100 has (almost) never given me the correct depth.

Reads correct when vessel is stopped or bottom is very flat.

Consistently reads inconsistently +or- 1 to 10 fathoms when vessel is in motion in an average of 30 fathoms. Does not appear to be dependent on whether bottom is deeper or shallower ahead/aft/port/stbd of the vessel, in my mind ruling out a problem with the fairing block.

Any thoughts?
 
First thing that comes to mind is turbulence. Are you certain there are no hull irregularities or thru-hull installations ahead of the transducer that could be causing bubbles or turbulence to run across the transducer face?
Are you getting any interference on the screen? Make sure you have good clean power. Low voltage or noisy power can causes all kinds of problems as well.
 
No interference on screen. No hull irregularities. Power is all good.

The sounder functions great, with the exception of the bottom depth being consistently inconsistently correct, unless the bottom is very flat of the vessel is stationary.
 
How is the transducer cable ran? Any tight coils of excess cable? Is it ran in a bundle with any power cables?
Can you get a dealer local to you to test your transducer?
 
Interesting thoughts regarding the transducer cable... Seems like that would cause interference rather than an incorrect bottom reading.?

Transducer cannot be tested locally.

Factory defective unit and/or transducer?

Could a transducer with too wide of a cone for my intended purposes be the culprit?

Transducer tap settings incorrect?
 
Those should give you consistent problems. Couple of questions.

1. Did it ever work properly? How long have you had it?

2. What is the model of your transducer? You mentioned the fairing block so I'm assuming you have a thru-hull.

3. What is your Sound Speed set at? Hold + and turn on the machine. Under the "Installation" tab you will find this setting. You want it at 1500m

4. You said the bottom error varies from 1-10ftm? It definitely is not constant? If it is constant it would be a draft setting.

5. Can you send us screenshots/photos on this. In the same depth of water a couple shots of different speeds?
 
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