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Old 08 May 2010, 20:56   #1
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Garmin pingy thingys

Looking at the Garmin GPSmap 551s, there are two options available for the sounder, a transom mount and a through-hull.

My Vipermax is going to have a through-hull sounder installed, seems to be the best way to go, the question is does it matter which type I use if it is just going to be glooped onto the inside of the hull?

As far as I can tell the proper "through hull sounder" is designed to be actually through the hull - in other words bore a hole in the bottom which I am not going to be doing.

I seem to remember seeing on here that some people have installed transom mount ones inside the hull or bilge well, so is there any reason for choosing one or the other? The transom mount one has a temp sender but that probably won't work inside the hull and anyway I don't need a computer to tell me the South Atlantic is too fkn cold to swim in

The transom mount type is a little cheaper so if there is no reason for choosing one or the other, I guess I would go for that.

Any thoughts please?
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Old 09 May 2010, 02:27   #2
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Mine's a transom mount one on a Garmin 172.It's sikaflexed into the inside of the hull and the temp sender works quite well.
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Old 09 May 2010, 02:30   #3
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Mine's a transom mount one.It's sikaflexed into the inside of the hull and the temp sender works quite well.
I have had all the vessels I owed the same way except for one rib and they have all worked very well. No problems so long as they are set at the right angle and well fixed in...and they have all been the transom mount type.
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Old 09 May 2010, 04:06   #4
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Old 09 May 2010, 04:35   #5
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Looking at the Garmin GPSmap 551s, there are two options available for the sounder, a transom mount and a through-hull.

My Vipermax is going to have a through-hull sounder installed, seems to be the best way to go, the question is does it matter which type I use if it is just going to be glooped onto the inside of the hull?

As far as I can tell the proper "through hull sounder" is designed to be actually through the hull - in other words bore a hole in the bottom which I am not going to be doing.

I seem to remember seeing on here that some people have installed transom mount ones inside the hull or bilge well, so is there any reason for choosing one or the other? The transom mount one has a temp sender but that probably won't work inside the hull and anyway I don't need a computer to tell me the South Atlantic is too fkn cold to swim in

The transom mount type is a little cheaper so if there is no reason for choosing one or the other, I guess I would go for that.

Any thoughts please?
Some manuals show you how to mount a transom transducer inside to the Hull.
Lowrance for one.!!
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Old 09 May 2010, 04:38   #6
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A constructive comment still it gets your number of post's up.
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Old 09 May 2010, 05:01   #7
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Originally Posted by BogMonster View Post
Looking at the Garmin GPSmap 551s, there are two options available for the sounder, a transom mount and a through-hull.

My Vipermax is going to have a through-hull sounder installed, seems to be the best way to go, the question is does it matter which type I use if it is just going to be glooped onto the inside of the hull?

As far as I can tell the proper "through hull sounder" is designed to be actually through the hull - in other words bore a hole in the bottom which I am not going to be doing.

I seem to remember seeing on here that some people have installed transom mount ones inside the hull or bilge well, so is there any reason for choosing one or the other? The transom mount one has a temp sender but that probably won't work inside the hull and anyway I don't need a computer to tell me the South Atlantic is too fkn cold to swim in

The transom mount type is a little cheaper so if there is no reason for choosing one or the other, I guess I would go for that.

Any thoughts please?
Stephen, if you wanted a through hull unit then I am sure Osprey would fit it for you whilst the boat is being built, make sure you also spec a hatch to access it though in case it ever fails.

Otherwise just do what I did and get busy with the jigsaw !

Osprey will also fit a transom sounder into the hull if you ask them to however reading your post I assume that you are going to fit your own electronics?
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Old 09 May 2010, 05:08   #8
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Stephen, if you wanted a through hull unit then I am sure Osprey would fit it for you whilst the boat is being built, make sure you also spec a hatch to access it though in case it ever fails.

Otherwise just do what I did and get busy with the jigsaw !

Osprey will also fit a transom sounder into the hull if you ask them to however reading your post I assume that you are going to fit your own electronics?
A round access hatch cover is what i am going to use .
The well has been formed in readiness for a later installation.
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Old 09 May 2010, 08:52   #9
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Chris, Roy is going to get the hull built with a waterproof hatch in the deck in front of the bilge to allow installation of a sounder. Similar to what you have I think, but I left the detail to him.

I haven't decided whether to get them to do the electronics or do it myself, there are various pros and cons. I would prefer to get it done there but then run a bigger risk of it getting nicked/broken in transit, and if I did it myself I could choose the final instrument layout to suit my sitting position etc. There's also slight doubt over the early August delivery date to meet the boat I want to ship it on, so if the choice is ship it on that and fit the electricity myself, or delay by six weeks, I'll be doing the electrics myself.

What I may do is get them to install the Garmin transducer into position, run the cable up to the console and leave the actual instrument to put in myself - the hull is going to be 8 weeks being born so no hurry yet.

If the sounders work well pinging through the hull like yours and others, I would prefer it like that, as there is much less chance of physical damage, replacement is easier if it fails and with less chance of a leak. I would think the real "through hull" (= hole in boat) is better left for much bigger boats where they aren't likely to be beached - something sticking out 1/4 of an inch is going to be vulnerable in several situations including loading on the trailer.

Looks like a transom type and a tube of Sikaflex is the way to go - thanks
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Old 09 May 2010, 11:05   #10
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If they (Osprey) are going to mount the transducer for you, I would recommend the proper in-hull (shoot thru hull) type. I think it is designated P79 by most manufacturers. You might as well get the correct type for its intended position. I am sure a transom mount glued in place is fine, but why compromise when you've got the opportunity to do it correctly right from day one.
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