12 Meter Express -Dart datamarine depth finder

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tcollins2
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12 Meter Express -Dart datamarine depth finder

Post by tcollins2 »

Yesterday, my depthfinder started acting up and now just shows - - - across the display. if I use the other functions like the alarm the display works fine. I took it out of the dash and all the connections were fine, no loose wires. Going to the other end I started looking for where the transducer was. I don't recall exactly where it was on the hull but it was starboard side about 24 inches out from the keel. I'm assuming that these were factory installed since I understand they didn't core the hull in the area where there would be a thru hull fitting. I opened up various hatches and looked around but I can't find it. I'm getting nervous that it might be under the holding tank. It's too cold to go swimming to get a good measurement. Anyone have any experience locating and changing out the transducer or installing a new one?
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1990 Trojan 12M International Express Detroit Diesels 6-71T's, 425HP

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Liberdade
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Re: 12 Meter Express -Dart datamarine depth finder

Post by Liberdade »

On my 11 Meter Express, the transducer is near the mid bilge pump. As you said, it is about 24" starboard of center (from my memory). I had mine changed out when I upgraded the original depth finder.
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tcollins2
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Re: 12 Meter Express -Dart datamarine depth finder

Post by tcollins2 »

Contacted www.dmimarine.com. They are extremely helpful. The unit I have is multifunction depth, speed, water temp, log but depth is one transducer and speed and water temp is another transducer--two holes. I just have the depth functionality transducer. Either way I need to find and probably cut a hole in the floor to get access to the transducer. Most likely the transducer is bad so I'm in for a few hundred. Or I go for a few more hundred and get a chartplotter with a multifunction transducer. Not a fan of making another hole in the hull for the added functionality of the Dart unit. Reuse the hole and fairing block if I go new.

There was another scenario where the "brain" under the dash may not be working either. All can be repaired but, do I want to sink money in to a 25+ year old device? The current large display takes up some real estate on my dash just for a depth reading. Decisions...
1990 Trojan 12M International Express Detroit Diesels 6-71T's, 425HP

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RWS
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Re: 12 Meter Express -Dart datamarine depth finder

Post by RWS »

best not to throw good $$$ after bad.

The only issue will be changing out the 'ducer

When is your next haulout scheduled?

Otherwise, can you a new chartplotter where you can have a transom mounted transducer that can later (when you do your next haulout) be changed over to a through hull?

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Re: 12 Meter Express -Dart datamarine depth finder

Post by tcollins2 »

With the heat wave we had, no problem diving under the boat to find the transducer. No wonder I couldn't find it, it's under neath the starboard motor. The second transducer for speed and temperature is under the port motor. It has a pin in it and at one time I guess you can pull the unit out to service it. I have never had one of these transducers with a paddle wheel. I'm beginning to think spending anytime salvaging this system is a waste of time. The boat had gas motors in it originally, so when they switched to detroit diesels, servicing these transducers wasn't an issue. Any 12M owners have a good location for a new transducer?
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El L Sea
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Re: 12 Meter Express -Dart datamarine depth finder

Post by El L Sea »

Ours sit in the center bilge near the A/C and generator thru hulls. On the 1988 12m Sedan, that section of hull is solid glass.
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Re: 12 Meter Express -Dart datamarine depth finder

Post by tcollins2 »

Thanks! You read my mind. (is that one of the locations that is not cored?)
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Re: 12 Meter Express -Dart datamarine depth finder

Post by El L Sea »

tcollins2 wrote:
Mon Jul 02, 2018 3:00 pm
Thanks! You read my mind. (is that one of the locations that is not cored?)
That is correct.
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Re: 12 Meter Express -Dart datamarine depth finder

Post by Doc Holiday »

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Tcollins2,

My Datamarine unit was showing its age and I could barely make out the numbers. Didn't need the speed log input so I replaced it with a Sandpiper model that just shows depth. One thing I noticed was that the RCA type jack that plugs into the unit has to be tight. Otherwise it displays " ------ "

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tcollins2
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Re: 12 Meter Express -Dart datamarine depth finder

Post by tcollins2 »

Thanks, I'll check that out too.
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Re: 12 Meter Express -Dart datamarine depth finder

Post by tcollins2 »

Confirmed 100% fiberglass in that location. Phew.
DA4042E4-5F33-4327-8667-9D049111D339.jpeg
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Re: 12 Meter Express -Dart datamarine depth finder

Post by prowlersfish »

It must be the photo but that looks like a cored section . With the reflection its hard to tell
Last edited by prowlersfish on Sat Apr 27, 2019 8:51 pm, edited 1 time in total.
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Re: 12 Meter Express -Dart datamarine depth finder

Post by tcollins2 »

Nope, 100% fiberglass. Here’s a close up of the cut, about 1-3/8 thick.
12F94E5F-7AEF-43A1-8B24-A3F039C94FF2.jpeg
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Re: 12 Meter Express -Dart datamarine depth finder

Post by prowlersfish »

Much better , looks good
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Re: 12 Meter Express -Dart datamarine depth finder

Post by RWS »

What new equipment have you chosen to go with?

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1983 Trojan International 10 Meter
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