How can I identify the waterline from inside? - SailNet Community
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post #1 of 17 Old 10-10-2013 Thread Starter
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How can I identify the waterline from inside?

Is there an easy or simple way to correctly identify the waterline while inside the boat? I'm contemplating an overhaul of the head system and need to install an airgap above the waterline but space is tight...
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post #2 of 17 Old 10-10-2013
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I would think if you are in still water, you could measure down from the deck joint outside, then make the same measurement inside (assuming you can locate the joint from inside. Or use any other reference point.
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post #3 of 17 Old 10-10-2013
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Re: How can I identify the waterline from inside?

Attach a "water level" to an underwater thru hull fitting.
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post #4 of 17 Old 10-10-2013
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Re: How can I identify the waterline from inside?

I would try a hand held infra red thermometer and shine it on the inside of the hull to see if can find the boundary between the water temperature and the air temperature.

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post #5 of 17 Old 10-10-2013
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Re: How can I identify the waterline from inside?

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Originally Posted by Seaduction View Post
Attach a "water level" to an underwater thru hull fitting.
A long piece of soft transparent tubing (tygon) temporarily attached to any open through hull with the end carefully held above the waterline would flood to the same height... should work!

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post #6 of 17 Old 10-10-2013
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Re: How can I identify the waterline from inside?

not only that.. but as long as the majority of the hose were kept beneath the waterline.. you could use it anywhere aboard as water will -always- seek it's own level

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post #7 of 17 Old 10-10-2013 Thread Starter
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Re: How can I identify the waterline from inside?

I think post #2 will get me close enough, I was just wondering if there was some old mariners trick to it. Thanks for all the suggestions...
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post #8 of 17 Old 10-10-2013
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post #9 of 17 Old 10-11-2013
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Re: How can I identify the waterline from inside?

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Originally Posted by Faster View Post
A long piece of soft transparent tubing (tygon) temporarily attached to any open through hull with the end carefully held above the waterline would flood to the same height... should work!
Correct. That is a water level.
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post #10 of 17 Old 10-11-2013
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Re: How can I identify the waterline from inside?

So, I take it that my idea of: drilling a series of holes from the top down until water starts streaming in... is not going to win?

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