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Go Back   SailNet Community > Skills and Seamanship > Seamanship & Navigation > Can't get there from here!!
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Thread: Can't get there from here!! Reply to Thread
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Topic Review (Newest First)
08-02-2011 12:48 AM
davidpm
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.
08-02-2011 12:12 AM
CalebD 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.
08-01-2011 11:35 PM
davidpm So the last thing for this exercize is what could I have done to avoid the 1.25 motor at the end if anything?
08-01-2011 11:31 PM
davidpm 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.
08-01-2011 10:59 PM
davidpm
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.
08-01-2011 08:27 PM
CalebD David,
Two things.
While the current does essentially follow the coast line there are eddies and counter currents closer to shore and around obstacles like Faulkner Island. This is true even in the Hudson River which may have stronger currents then the LI Sound.

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.

I applaud your attempt at figuring out how this deviation may have happened as it may help you navigate more precisely in the future. It also may not as the conditions vary from day to day. One thing you can do is to monitor your GPS and heading to see when you are getting 'headed' and tack to the other point of sail.
08-01-2011 02:17 PM
davidpm OK that's a good theory eb current around Falkners but leg three is still a puzzle to me.

Leg three started out great. But as you can see I had to veer west for the last few hundred yards. Why? If the current was comming from west to east it should have curved me to the west especialy if I was slowing down pinching too much.

Unless it is the kind of thing where the current was right on the nose and if it got just to starboard of the boat it would push me west.
The good thing is that I've got the track so can obsess over this untill I figure it out.

I'm going to check the current directions for that area and see just how variable the directions are. I usually think of the current as more or less following the coast but maybe not. Obviously when it gets to inlets it has to change direction radacally to go up the inlet. This must cause local direction changes the closer you get to the shore.

Part of my problem is that leg 3 started out just the way I planned it. If it started wrong I would just have accepted that I misjudged the wind and/or current. What bothers me is that it started exactly as I planned but I veered off west the last bit.

The other half of the problem is that I had exactly the same issue with leg 4. Started off great then I veered off but east this time. This actually make sense as the current was going east.
But why did I get hurt both ways?

I've got my speed and location's on the whole track so I'm thinking I can plot out whole thing and maybe I can find a current speed and direction that would explain the behaviour.
Copping out and calling it a wind shift sounds too unplausable to me.
08-01-2011 09:17 AM
davidpm fixed keel
07-31-2011 10:43 PM
CalebD David,
If I know you and I think I do, you were not popping open beers the whole way but paying attention to your course.
I'm pretty sure that HPLou is on to something with the current building to the east (ebb) and moving around Faulkner Isl.
Is your Cal 25' the fixed keel or center board variety?
My best.
Caleb
07-31-2011 10:20 PM
HPLou It could be the current was picking up speed when you got out of the lee of Faulkner Island. With the pinching, the boat will lose forward speed and the current will have more of an impact on the boats direction.
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