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Old 06-16-2013, 04:15 PM   #21
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I'm going to try a through hull transducer in wax on my boat. I've been having intermittent trouble with my screen blinking and freezing in shallow water.

After having steering issues yesterday that "self corrected" for no apparent reason I think it's narrowed down to grass mats near my cruising area and low tides. My only logical summation(as my blinking issue only happens in less than 7 feet of water) is the grass is interfering with my transducer in the shallows and making my sounder blink the last reading.

Hopefully the in hull transducer will end this annoyance. Fortunately our bottoms are soft mud.
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Old 06-16-2013, 04:40 PM   #22
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. I've been having intermittent trouble with my screen blinking and freezing in shallow water.
.
That would drive me around the bend! Guess it comes from having a sailboat for so long, but I'm paranoid about having a depth indicator that is 100% reliable. In fact, on the sailboat I had two of them (one primary, and one backup which I kept turned off).

John
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Old 06-16-2013, 04:59 PM   #23
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Our boat came with a Hummingbird fishfinder. It is showing about 400+ feet sitting in the slip in the marina. It seems to be totally useless when you get below around 20 feet, about the time you really need it.

Tried all the tuning and tweaking but nothing has helped.

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Old 06-16-2013, 05:11 PM   #24
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Our boat came with a Hummingbird fishfinder. It is showing about 400+ feet sitting in the slip in the marina. It seems to be totally useless when you get below around 20 feet, about the time you really need it.

Tried all the tuning and tweaking but nothing has helped.

Bob
Um, perhaps you just have a deep slip?? :-)
.
Leaving the west end of Cuba, heading over to Isla Mujeres in Mexico, we hit about 12,000 feet. Very deep! My depth indicator just looked at me, and I could almost see it saying "You gotta be kidding!!"
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Old 06-16-2013, 05:55 PM   #25
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That would drive me around the bend!
Believe me, it has

I think I've found the problem and solution so I'm all better now
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Old 06-16-2013, 05:58 PM   #26
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Believe me, it has

I think I've found the problem and solution so I'm all better now
Share it. It may prove useful to one or more of us.
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Old 06-16-2013, 06:09 PM   #27
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A combination of having the unit on automatic range mode(per the manual) and the grass that grows in my local area. I believe the grass is getting stuck on my transducer or somehow causing interference that sends my sounder into stupid mode.

Post #5 of this thread and my steering issue that self corrected yesterday actually made me consider the transducer being interfered with. When I mount the new ducer inside the hull I'll report back.
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Old 06-16-2013, 06:39 PM   #28
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I guess a transom mounted transducer is there to confirm that you have just run aground?

Bob
My full keel extends to the rudder and is the deepest part of my draft, so when I am showing 4.0 feet, I am about 3 inches from a "touch". Transom mount is adequate in this regard because we have shallow rises in NC. I also have my original thru-hull Humminbird unit which measures amidships, but it is 1995 vintage and shows whole numbers and not any decimals. It's precision and accuracy are not always reliable, but it does the job with periodic filling of the oil cavity.
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Old 06-17-2013, 01:50 AM   #29
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I'm going to try a through hull transducer in wax on my boat. I've been having intermittent trouble with my screen blinking and freezing in shallow water.

After having steering issues yesterday that "self corrected" for no apparent reason I think it's narrowed down to grass mats near my cruising area and low tides. My only logical summation(as my blinking issue only happens in less than 7 feet of water) is the grass is interfering with my transducer in the shallows and making my sounder blink the last reading.

Hopefully the in hull transducer will end this annoyance. Fortunately our bottoms are soft mud.
Craig, my transom mount transducer used as a thru hull,(it came with the unit), sits in clear silicone,see earlier post. Before fixing I tried it in a bag of water.
My thru hull transducer very occasionally, momentarily, loses its grip on the bottom and blinks until it finds it, I suspect the transducer face may be dirty/needing a/f.
I think transom mount transducers are for trailered boats.
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Old 06-17-2013, 02:44 AM   #30
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That's how I mounted one in my Zodiac. Only have to remember to keep the water supply topped up though. And for the record, if the transducer or mount is off a few degrees it really doesn't matter. Unless you are doing hydrographic survey work the error is negligible and can be offset in any event.

I really like the wax idea, may use wax to replace the water.
All the depth sounders I have installed have come with ones designed for transom mounting - not ideal in a large vessel in my opinion, so as there is always a 2 inch puddle of water in my forward enginroom bilge and they work in there so well I just left them there, one placed either side of the keel and set at different frequencies they don't interfere with each other at all. I've considered setting them in Sikaflex, epoxy or even the wax idea, and come to the conclusion I would gain nothing, so why bother.
I have them fixed in the correct orientation and so they don't move, but as Rick points out, it is not that critical.
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Old 06-22-2013, 12:10 AM   #31
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I installed mine a "shoot thru the hull" Humminbird puck in wax. the wax is from a wax ring as used to seal a toilet onto a floor drain, available at any hardware store. I kneaded the wax well to soften it and remove air bubbles, put a blob of it against the hull and squished the puck into it. It worked well so I left it there that was about 4 years ago. it has worked fine since. This is a digital display model.
Pictured below with the floorboard lifted
A buddy with a sailboat with Raymarine pack had a sounder that stopped working properly. Raymarine said it was the black box unit, we installed a new one - no change. Borrowed a new transducer from our dealer, hung it over the side and problem solved. He said looks like a haul-out to replace it. I said the boys on TF said to stick it on the inside of the hull wthl wax from a toilet ring, we did it and it works great! So no rush haul-out required, will replace the thru hull transducer at the haul-out next year......THANKS for the GREAT idea!
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Old 06-22-2013, 08:21 PM   #32
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I installed a transducer inside my lazerett back by the rudder. If we stern tie over a ledge or swing it anchor over shallower water, I wanted to know if we were getting close to bumping. The instructions mentioned that the transducer would not read thru cored fiberglass or aluminum.

It happens. Glad it was not me. Prideaux Haven Desolation Sound BC several years ago
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Old 06-22-2013, 11:11 PM   #33
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They do make transducers specifically designed to be installed inside the boat on the hull. The inside of the hull needs to be ground down and cleaned, the device collar is epoxied to the fiberglass, the transducer can then be installed and adjusted to point vertically down, the void area is the filled with a oil type material specified by the manufacture. Any good electronics store can get these, and they are not that expensive. They work as good as a through hull device. I installed one with my Ray marine depth finder 10 years ago and it works great up to about 400 feet. I also have a second one with a traditional through hull, this system works just as good, and sometimes better since it doesn't seem touch up any dirt or mud that may get churned up.
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Old 06-23-2013, 12:33 AM   #34
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Presume a hull transponder won't work through a steel hull. That's why there is this minor, cylindrical appendage for the Coot's depth finder?

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Old 06-23-2013, 06:15 AM   #35
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Mark...probably just a spacer to level it and plastic to isolate it from the steel...
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