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post #1 of 11 Old 01-22-2013 Thread Starter
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Depth sounder & Batteries

I just got a lowrance LMS-525C DF from a friend of mine( freebie!) and i'm womdering what would be a good spot to mount the transducer through the hull? Its a 25 O'day tall rig with a sail drice & thought maybe in the hull in front of the sail drive?
Also the boat had 2 batteries in it and it has 2 red positive cables & 1 black negative cable down under the right side cockpit seat & a black negative cable in there that is about 18" long.They all have eyelet ends.i guess the cables would be set up 1 red to each positive terminal on each battery & the "main" black neg. to one battery neg terminal & the 18" one to the other neg.on the battery.It also has a "selector" switch( you can see it in these 2 pics) that is a large red rotation switch with "off - on 1-2 " or something like that on it.I'm taking it thats what selects what battery is used & which ones get charged? Question is what postion should i keep this switch at?
Thank you
Jim
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25 O'day 016.jpg   25 O'day 013.jpg  

Last edited by MSO sailor; 01-22-2013 at 07:38 AM. Reason: spelling
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post #2 of 11 Old 01-22-2013
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Re: Depth sounder & Batteries

Your depth sounder transducer is best fitted ahead of the keel, on the centerline of the boat. It can be offset if no suitable centerline position is available, but it should be ahead of the deepest part of the boat. The keel, saildrive, propwash etc can interfere with a good signal when mounted aft.

As far as the battery switch goes the answer is 'it depends'... on just how things are wired up. Most likely whichever battery you're switched to will be used AND receiving a charge if the engine is running, however in some cases the charging circuit does not go through the switch. More investigation is needed here..

Some boats will have a 'house' battery for lights, electronics, etc, (usually a deep cycle) and the second will be an engine starting (hard cranking) battery... but that's not universal either.

SNer Mainesail has great info on such systems, with 'the word' on what works best. Have a search around... and have a look here:

Compass Marine "How To" Articles Photo Gallery by Compass Marine at pbase.com

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post #3 of 11 Old 01-22-2013
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Re: Depth sounder & Batteries

You might consider an "inside the hull" transducer instead of drilling through the hull. Airmar makes many of the transducers, you should be able to look up your sounder to see if they have one available.
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post #4 of 11 Old 01-22-2013
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Re: Depth sounder & Batteries

Been reading up on those "inside the hull" mounts. From what I have read they tend to distort readings over 150feet deep. Unless you are looking for the Marinaras trench or submarines, nothing to worry about.

I like the idea of one less hole in the hull

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post #5 of 11 Old 01-22-2013
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Re: Depth sounder & Batteries

I mounted an Airmar inside my hull and it works beautifully. It takes a little "cleverness" finding the right spot and mounting it with its face at the correct angle. If I figured it out anyone can. Its base stays filled with antifreeze to maintain the transducer's contact with the hull. No hole in the hull and no protrusion. I found a spot just ahead of the keel a little off the center line. It required a removable section in the sole but it is out of the way.

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Re: Depth sounder & Batteries

it's also out of harms way. Can't catch it on anything, damage it in a grounding, or have the travellift jockeys crush it with a sling

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post #7 of 11 Old 01-22-2013
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Re: Depth sounder & Batteries

In order to locate a spot in the hull for mounting a transducer to "shoot through the hull," use a ziplock bag with some water in it to act as a "pillow" under the transducer while you try different locations. Once you find a place that seems to work well, mount it there.

To mount my transducer, I simply secured it (normally an in-the-water type) with some silicone glue. I put a bed of silicone glue on the hull, being careful not to introduce any air bubbles, then put some on the transducer itself. I then mushed the two together, again being careful not to introduce any air bubbles, and secured it overnight with some duct tape. The next morning it was workin' like a champ!


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Re: Depth sounder & Batteries

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Originally Posted by Dfok View Post
You might consider an "inside the hull" transducer instead of drilling through the hull. Airmar makes many of the transducers, you should be able to look up your sounder to see if they have one available.
The Transducer i have says it can be "epoxied" to teh inside of the hull which is what i will be doing.It seems alot easier to glue it in front of the saildrive.
Jim
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post #9 of 11 Old 01-23-2013
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Re: Depth sounder & Batteries

I suggest that if you ever have to remove the transducer, it will be much easier to remove it from silicone, than it would be to remove it from epoxy.


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post #10 of 11 Old 01-23-2013
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Re: Depth sounder & Batteries

The Airmar transducer mount allows the transducer to be removed by simply rotating it in the mount and unlocking its rim from the mount. The mount is fastened to the hull with silicone (ugh) One of the only uses for silicone I endorse. It seals the mount to the prepared hull and provides a watertight compartment that holds the antifreeze (liquid) which "connects it" to the hull.

The tricky part of using this mount is figuring out the alignment of the mount into which the transducer gets "locked". Since the transducer's face is beveled and the hull is sloped, getting the final orientation of the locked in transducer correct locates the mount. The mount is also beveled so it becomes a little complex. Patience and care are required. Even after double checking my locations I held my breath while I operated the depth sounder and checked the readings against my charts. I am satisfied that I do have it pointing straight down. Relief!

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