Getting current Current Maps - SailNet Community
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post #1 of 10 Old 03-27-2018 Thread Starter
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Getting current Current Maps

This site shows currents worldwide and updates every 5 days...I think it's 5.
https://earth.nullschool.net/#curren...113.703,-4.139

How do you get info on currents for voyages?
There are well known current patterns, Gulf Stream etc, but do you look for info on other currents before setting off ...and during passage?

Some weather prediction services offer currents shown in their hi-$ levels. Where are they getting their info from? Is their info updated every 5, etc...

There are some currents (other than the known biggies) strong enough to entice you off the great circle, considering winds of course
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post #2 of 10 Old 03-27-2018
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Re: Getting current Current Maps

Currently all current stuff is total and utter balderdash. Except for the Gulf Stream... But that has a few MAJOR problems:

1) the bloody damn latitudes and longitudes are NEVER shown. That cute link you show is lovely but try transposing that to your plotter. Impossible!

2) The currents move! That stupid Gulf Stream maybe here today but gone tomorrow. Who does that?

3) Currents are easy... It's the eddies that PICKLE MY GRANDMOTHER!

4) the Gulf Stream is the only easy to define current... Usually they are just a waft. With eddies.

5) I don't think you can really be in the Gulf Stream for all that long in a small sailing boat. I have crossed it now about 6 times (?) and it's always a bit weird. In 2019 may/June I am going to go up the Gulf Stream from the Bahamas to New York. It's going to be interesting to see how it goes. The truck is to sit close to the western edge and duck out quick if the weather changes but in deep enough to not hit an eddie.


So ask again next year 😂😂😂😂

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post #3 of 10 Old 03-27-2018
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Re: Getting current Current Maps

Mark download the pic of the stream off the net but also take a thermometer. Its simple but it works I like to measure temperature at least 10 below the surface so prefer one on a string. They say reading the breakaways and eddies is more important to the Marion Bermuda than having a rockstar for crew. Getting a read on the coastal counter current( if there is one) may help if going south.

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post #4 of 10 Old 03-27-2018
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Re: Getting current Current Maps

Oh, sorry, I forgot to mention how I actually plot the Gulf Stream lol

Passage Weather has the little charts. I draw lat & Lon lines and plot off that.

But it's as inaccurate.

I would love an overlay.

As for temps... I just shove my hand under the salt water tap. But have wondered how good a thermometer would be.
I might buy one for next year.

What temperature range?

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post #5 of 10 Old 03-27-2018
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Re: Getting current Current Maps

So, can I assume that some of the small details shown on maps like https://earth.nullschool.net/#curren...113.703,-4.139 are just artistic license?

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post #6 of 10 Old 03-28-2018
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Re: Getting current Current Maps

Quote:
Originally Posted by Barquito View Post
So, can I assume that some of the small details shown on maps like https://earth.nullschool.net/#curren...113.703,-4.139 are just artistic license?
Not at all.

Transpose that info to a plotter.


.

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post #7 of 10 Old 03-28-2018
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Re: Getting current Current Maps

Quote:
Originally Posted by MarkofSeaLife View Post
Currently all current stuff is total and utter balderdash. Except for the Gulf Stream... But that has a few MAJOR problems:

1) the bloody damn latitudes and longitudes are NEVER shown. That cute link you show is lovely but try transposing that to your plotter. Impossible!

2) The currents move! That stupid Gulf Stream maybe here today but gone tomorrow. Who does that?

3) Currents are easy... It's the eddies that PICKLE MY GRANDMOTHER!

4) the Gulf Stream is the only easy to define current... Usually they are just a waft. With eddies.

5) I don't think you can really be in the Gulf Stream for all that long in a small sailing boat. I have crossed it now about 6 times (?) and it's always a bit weird. In 2019 may/June I am going to go up the Gulf Stream from the Bahamas to New York. It's going to be interesting to see how it goes. The truck is to sit close to the western edge and duck out quick if the weather changes but in deep enough to not hit an eddie.


So ask again next year 😂😂😂😂
The Latitudes and Longitudes are shown if your "click" on a particular spot.
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post #8 of 10 Old 03-28-2018
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Re: Getting current Current Maps

It takes but a quick look at the sailing directions of a hundred and fifty years ago to see how our sailing ancestors coped with the "Stream". All they had was compass and sextant.
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post #9 of 10 Old 03-28-2018 Thread Starter
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Re: Getting current Current Maps

You can double-click to zoom in.

The outflow of the Amazon looks like a Wild West shootout.... 4 knots in places. Jacuzzi area...

The Gulf Stream, Aguhlas, and that one across Japan in the N pacific, beginning around Taiwan look like the global biggies.

Supposedly, Indonesia has the most extreme currents. Prob the bash/filtering of the S pacific tropicals.....

I've used 1 m/s to roughy = 2 knots.
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post #10 of 10 Old 03-29-2018
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Re: Getting current Current Maps

FWIW, there's a feature request in OpenCPN to support the OSCAR data (which is what earth.nullschool.net uses). But also, that data is in GRIB format, so you should be able to put it on your chartplotter: How to Get World-Wide Ocean Current Data via Email in GRIB Format-- OSCAR -- NOAA.
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