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


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  #11  
Old 08-01-2011
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Quote:
Originally Posted by CalebD View Post
David,
The other thing is a question about the track you uploaded. Should I assume it is from your GPS? We use our Garmin GPS during races and it saves many of our previous tracks. I'm wondering if this is where the leg you marked with a "?" came from. There are also moderate wind shifts that occur which would help explain the not so 'erratic' course you show.
Yes it from my Garmin
Leg one was a pretty simple run.
Leg 2 was as close to the wind as I could get.
I tacked to leg 3 under theory that I didn't want to end up down current when I got near shore.
The ?mark at the end of the arrow is the segment of leg 3 where I lost my heading by about 30 degrees and don't know why.
Leg 4 was again as close to the wind as I could make it.
At the end of leg 4, the last 4 minutes you can see how I was again loosing my heading by about 20 degrees again a minor puzzle but the current could explain it except that whey didn't the current bother the course for the first 17 minutes of the leg?

Leg 5 I just motored back to the mooring about 1.3 miles.
Between leg 1 and leg 5 there is an unlabeled leg that was from a prior day.

Caleb thanks for taking an interest in my little puzzle.
I just talked to a sailor who has had many decades experience and he sort of accepted this sort of thing as part of sailing.
I'm trying to be a little more scientific about it.
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  #12  
Old 08-01-2011
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I think I have a solution to what happened.
What do you think?
I had an approximately 90 degree current of at least 1 knot from point 1 to point 2 but since I was in the lee of the Island perhaps it did not affect me much.
From Point 2 to Point 3 I suspect the current changed direction from the 90 degrees because of the outflow from Clinton harbor, the entrance of which if Half Acre Rk.
This outflow headed me up.
From Point 3 to point 4 this current is sweeping me towards the 49 degree which is a little surprising as this is about what I got from point 1 to point 2.
At point 4 I'm not sure what happened but I was now doing 69 degrees.
I was at point 4 at 2:10 and at 1:23 in the center of the sound the wind changed to the east 20 degrees. Maybe it took a little while for that change to make it to Madison.
Maybe the wind slacked so the current vector was stronger.
I only gave it 4 minutes before I turned on the motor as I had a sick passenger so while I don't know for sure at least I have a theory.
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Last edited by davidpm; 08-01-2011 at 10:34 PM.
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  #13  
Old 08-01-2011
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So the last thing for this exercize is what could I have done to avoid the 1.25 motor at the end if anything?
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Old 08-01-2011
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Feed your sick passenger some giner ale or other ginger product?
OK. Here is what I have for you.
We've been sailing on the Hudson now for a number of years where the current is either upriver (N) or down (S). It is of importance to get up current when you start off a day sail so you have an easy time getting back. Perhaps you should have tried to circumnavigate Faulkner Island and you would have had fair currents back to your harbor.
I am all talk and very little action so take that for what it is worth.
I hope to be looking for Sturgeon jumping on the Hudson from 8/2 - 8/4 aboard my Tartan 27'. We often hope for fair winds and following seas but this is not always the case.
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Old 08-01-2011
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Quote:
Originally Posted by CalebD View Post
It is of importance to get up current when you start off a day sail so you have an easy time getting back. Perhaps you should have tried to circumnavigate Faulkner Island and you would have had fair currents back to your harbor.
Of course, I've learned that lesson the hard way some time ago.
In this case we were headed for LI for the weekend but had to beat back due the sick part.
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