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post #11 of 14 Old 08-05-2013
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Re: Navigation puzzle

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Originally Posted by davidpm View Post
That is the whole problem.
I was very surprised to make that speed against what I expected to be a strong ebb current.

This is a 24' boat that probably can only do 6 in perfect conditions.

Maybe it is as simple as that. I had perfect conditions and was making 6 through the water and 3 over ground.
That may be the answer.

I guess that is what I was implying.

Your position looks like you were approx. 1/2 mile north (m) of race rock and west of the tip of Fisher's Island ( race pt.) In about 50 to 80 ft of water. I've never been in that particular spot, so can't offer local knowledge re the strength and direction of the currents in that exact spot. You may have been out of the strength of the ebb. There may be eddys?

I usually pass through between race rock and valiant or valiant and little gull where, as you know, depths are over 200'
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post #12 of 14 Old 08-05-2013
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Re: Navigation puzzle

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Originally Posted by davidpm View Post
Today at 1:15 PM was at approx. 41° 15N and 072° 03W
As you can see by my track

I did a quick check on my GPS and noticed I was very close to max ebb for the Race so figured I would turn around. The wind was very good about 15 knots.

I figured with that much current against me I would only make a couple knots overground.

As you can see I was going 4 to 5 knots.

Any explanation as to why.

The only thing I can thing of unless you see a dumb mistake is that I was just out of the current by a few hundred yards.

It would seem that anyplace in that area would have significant current though so I'm perplexed.
Do you use Eldridge? The answer to your question may lie in Eldridge. The maps with current directions and speed there may help.

More importantly, as others have mentioned:
Depth
Your angle vs the (actual) current
the fact that these predictions are educated guesses and not pure science
local knowledge

I sail this area all the time and have been for years. If you are trying to figure out why the current was not doing exactly what it was supposed to do when it was supposed to do it, my advice to you would be; Good luck

When it's nearly an hour past "predicted slack" and the nuns and cans are still healing and straining against a current that should be with you by now.... welcome to New England.

HANUMAN
'88 C&C 30 MKII
NOANK, CT

Last edited by RobGallagher; 08-05-2013 at 10:41 PM.
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post #13 of 14 Old 08-07-2013 Thread Starter
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Re: Navigation puzzle

Thank you all. It seems like I have to chalk this up to sheets happen. The problem is that before we turned around I warned everyone that we might have a slow slog back so when we hummed right along my wife goes: "So you don't seem to have this current thing figured out do you"
Sigh!!

The lesson from the Icarus story is not about human failing.
It is a lesson about the limitations of wax as an adhesive.
If you have an engineering problem solve it.
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post #14 of 14 Old 08-07-2013
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Re: Navigation puzzle

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The problem is that before we turned around I warned everyone that we might have a slow slog back so when we hummed right along my wife goes: "So you don't seem to have this current thing figured out do you" Sigh!!
Tell her that no one does; the tide tables are more like guidelines than actual rules.

...and you might want to slip Poseidon a noggin of something tasty by way of thanks.

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