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Admin Bill
(@administrator)
Member Admin
Joined: 3 years ago
Posts: 66
06/08/2018 10:42 am  

The transom-mounted transducer for the depth sounder which was professionally installed by the original owner was apparently mounted too high and sits above the waterline when the boat is unoccupied or there is little or no weight aft.  I am assuming that is the cause of the erratic behavior.  If the boat squats a bit (as with me at the helm) the transducer apparently gets wet and then works as it should.  It looks like the installer assumed the top edge of the bottom paint matched the waterline.  Nope.

Bummer.

 

I've also read warnings that transom-mounted transducers should not be used with inboard engines.  Hmmmm.

We'll see what can be done over the winter.

Bill

This topic was modified 3 years ago 3 times by Admin Bill

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DC Marine
(@dc-marine)
New Member
Joined: 3 years ago
Posts: 1
07/08/2018 12:18 am  

Just like real estate, location, location, location. If it isn’t in the water it will not function correctly. It must maintain contact with the water. You have the problem solved.

This post was modified 3 years ago by Admin Bill

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Admin Bill
(@administrator)
Member Admin
Joined: 3 years ago
Posts: 66
08/08/2018 9:32 am  

Here's the problem.  "Professional installation."

transducer
This post was modified 3 years ago by Admin Bill

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Admin Bill
(@administrator)
Member Admin
Joined: 3 years ago
Posts: 66
11/08/2018 10:04 am  
Posted by: Admin Bil

Here's the problem.  "Professional installation."

transducer

Remedial strategy?

Remove the transom-mounted transducer completely and install one inside the hull (maybe a Garmin GT15M-IH) instead?  Remove the old one, repair the damage and install the new one inside?  Access should be easy.
 
I don't know why the "professional installer" didn't do this the first time around.  The IH transducer does cost more, but installation is much easier. 
 
Bill

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Admin Bill
(@administrator)
Member Admin
Joined: 3 years ago
Posts: 66
16/08/2018 10:59 pm  

More knowledge....

We can add sufficient weight aft to wet the transducer, but it only functions properly when the boat is at rest.  Underway, no joy.

That tells me the installation of the transducer in the shadow of the transom is as much of a killer mistake as mounting it above the waterline.

We've made arrangements to fix all this when the boat is pulled this fall.

Bill


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Admin Bill
(@administrator)
Member Admin
Joined: 3 years ago
Posts: 66
03/09/2018 12:12 pm  

Parts assembled for the off-season repair:

Garmin Airmar P79 Transducer 010-10327-20

Garmin's 8/4 pin adapter cable 010-12719-00

I'm hoping to salvage the Garmin EchoMAP 44dv chartplotter


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Grant
(@grant)
Eminent Member
Joined: 2 years ago
Posts: 22
15/01/2019 8:36 pm  

What is the idea of having a depth finder?   If it's to detect shallows,  you'd want it near the bow,  I'd think.   


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Admin Bill
(@administrator)
Member Admin
Joined: 3 years ago
Posts: 66
17/01/2019 9:04 am  

Hmmm.  The transducer comes with a fairly lengthy cable.  I'll look around for available space a bit more forward.

Bill


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