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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > Navigation puzzle
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Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.


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Topic Review (Newest First)
08-07-2013 01:57 AM
manatee
Re: Navigation puzzle

Quote:
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.
08-07-2013 01:27 AM
davidpm
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!!
08-05-2013 11:24 PM
RobGallagher
Re: Navigation puzzle

Quote:
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.
08-05-2013 11:00 PM
Tempest
Re: Navigation puzzle

Quote:
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'
08-05-2013 09:41 PM
davidpm
Re: Navigation puzzle

Quote:
Originally Posted by aeventyr60 View Post
The wind and speed gods looked favorably upon you today. Sometimes all the data just gets crushed by whims of mother nature. maybe your just getting to be a better sailor?
That is very generous of you, more likely I'm missing something important.
08-05-2013 09:40 PM
davidpm
Re: Navigation puzzle

Quote:
Originally Posted by Tempest View Post
Hi David, your screen shot shows 3.6 mph which is 3.1 kn. Am I missing something?
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.
08-05-2013 09:37 PM
davidpm
Re: Navigation puzzle

Quote:
Originally Posted by chucklesR View Post
Currrent like wind is whimsical and whirly.
A screen shot is but a moment in time.
Typically but in this location it is 3+ knots and my whole return trip was over an hour faster than expected.
08-05-2013 09:35 PM
davidpm
Re: Navigation puzzle

Quote:
Originally Posted by jackdale View Post
How close to the current station were you? That can make a lot of difference.

What your speed SOG or through the water?
I was hoping you would take a look at this for me.

The first picture shows the location of the current station.
It is the one labled The Race and is the second one on the list.
My location is on the third picture.

The only explanation I can come up with what you are implying.
That I was just far enough out of the race to have less current.

That really doesn't make a lot of sense however as the race is knows for very strong currents due to the bottom going from 200' to 50' so one would think the current would be everyplace in that neighborhood with some variation.
08-05-2013 11:40 AM
chucklesR
Re: Navigation puzzle

Currrent like wind is whimsical and whirly.
A screen shot is but a moment in time.
08-05-2013 09:44 AM
Tempest
Re: Navigation puzzle

Hi David, your screen shot shows 3.6 mph which is 3.1 kn. Am I missing something?
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