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Go Back   SailNet Community > General Interest > General Discussion (sailing related) > Website with currents shown on chart with arrows
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Topic Review (Newest First)
07-02-2013 09:24 AM
JonEisberg
Re: Website with currents shown on chart with arrows

Quote:
Originally Posted by smurphny View Post
Thanks for posting that current graph Jon. But, don't you need some of those plastic hinged thingies to use it?
LOL! Yeah, I forgot, that does take it to a whole 'nuther level of complexity, in addition to actually having to look up the time of the flood or ebb at DE Bay Entrance...

As nifty as some of these animations can be, I've still yet to find anything that's simpler to use when figuring a transit of DE Bay, particularly on the ebb...

Having said that, I did make a trip north several months ago, with crew aboard who had an iPad loaded with all the goodies... No question, it was very slick, and I can certainly see the appeal to many, particularly those who are new to sailing, and might not be familiar with more traditional means, or who rarely venture beyond waters where 4G cell coverage, or whatever, is available...

But time has passed me by, for sure... Hell, my Nokia cell phone is so old and outdated, it doesn't even have a camera... (grin)

This is one of the more useful downloadable tide/current predictors I've come across, it's free with very extensive coverage beyond US waters, particularly in places like Atlantic Canada and the Bahamas...

JTides Home Page


07-02-2013 08:28 AM
smurphny
Re: Website with currents shown on chart with arrows

Thanks for posting that current graph Jon. But, don't you need some of those plastic hinged thingies to use it?
07-02-2013 12:36 AM
chef2sail
Re: Website with currents shown on chart with arrows

Rick,

Navionics has at least 15 current stations and when you click on one it gives you the current direction with arrow as well as the exact speed speed. It also has a 36 hour timeline you can move the curser along it and it moves the current graph changing the direction and current speed commensurate with the time, giving you exact readings for that time in the future.

In addition in this data box you can alter the date to obtain the same data from any time and date in the future.

A click on this box gives you a chart max ebb and flow times with current speeds for that particular station.
07-01-2013 11:57 PM
TakeFive
Re: Website with currents shown on chart with arrows

Quote:
Originally Posted by davidpm View Post
I'm looking for LIS

Old school was Eldridge.
I've got a hand held gps with currents.

I'm thinking it would be handy to go to a website and pick a place and time and have a bunch of arrows with numbers showing the strength of the current.

I can work it out of course with the noaa tables but it seems like it should be available.
I tried sailflow it and shows wind not current.
I tried weatherunderground again wind not current.
The deepzoom.com site that someone else suggested looks great for LIS. But it's unusable for me because it does not have a single current station anywhere in the Delaware Bay or River. This is surprising and disappointing, since currents are such an issue in the Delaware, and the Delaware is so important for commerce. Deepzoom has a whole bunch of tidal stations in the Delaware, but who cares about tides in a 45' deep river? It's currents that really matter there.

Most of the other suggestions (Bluecharts program, etc.) only give an arrow representation of the present-time current predictions, and often will only do this when you zoom way in. In order to get future predictions, most require you to pull up a chart on one station at a time. This is very tedious if you want to see a whole region with multiple current statiosn. The nice thing about DeepZoom is that you can set a future date and time and see the effect on the currents for a whole bunch of locations at once. (In fact, you can even animate the display over a range of time.) That is very nice for planning a lengthy passage, where you might want to see how the tidal wave propagates up a river or across a sound.

But like I said, deepzoom doesn't give currents for the Delaware, so I have to use something else. I've really gotten to like the Currents app for Android. Like deepzoom, you can view arrows for a whole region. The length of the arrows roughly represent the relative speed of the current. You can tap on any of the arrows to pull up numerical information. You can also cache up to 30 days of data on your tablet/phone so that you can use the app without a wireless connection. It's not quite as fancy as deepzoom, but it has a much more extensive database that includes the entire US NOAA database of current stations.





When I mentioned the tidal wave moving up a river, the below pic illustrates what I mean. You can see slack water around Wilmington, flood current south of the canal, and ebb current up in Pennsylvania. These differences are precisely why it's so helpful to see a graphical representation of the currents over a wide area:

07-01-2013 11:14 PM
chef2sail
Re: Website with currents shown on chart with arrows

Quote:
Originally Posted by CalebD View Post
I'm an Eldridge fan as well.
The Stevens Institute data for the LI Sound is largely modeled as Tommays points out. Still cool to look at but I don't need it aboard my boat.
In fact, I think it was an old post by Tommays who linked to the Stevens website that first got my attention.
Makes sense double checking against Eldridge. I do this all the time also as I like confirmation of the Navionics program. Delaware, LI Sound , New Jersey inlets etc.

1/4 time to check in Navionics.

Guess what!! The Navionics has never been wrong......and neither has Eldridge.
07-01-2013 09:59 PM
CalebD
Re: Website with currents shown on chart with arrows

I'm an Eldridge fan as well.
The Stevens Institute data for the LI Sound is largely modeled as Tommays points out. Still cool to look at but I don't need it aboard my boat.
In fact, I think it was an old post by Tommays who linked to the Stevens website that first got my attention.
07-01-2013 09:06 PM
Tempest
Re: Website with currents shown on chart with arrows

Jon, you certainly won't get anything for it..if you keep posting it...so I can print it ;-)
and make my own copy. Thanks..

I like thumbing through eldridge. Regardless of what other electronic sources I use they always get checked against the little yellow book.
07-01-2013 08:42 PM
JonEisberg
Re: Website with currents shown on chart with arrows

Quote:
Originally Posted by tommays View Post
I have looked at the Stevens Institute sight for years after they did a current lecture for sailors a while back

Its really a bit to much information and requires a beefy data connection and computer to use onboard

The eldridge old as it is has GREAT drawings of LIS for every hour of the ebb and flood and I am not sure what people find lacking in it ?
Yup, that's what I've got to wonder, as well...

From the OP's initial post:

Quote:

I'm thinking it would be handy to go to a website and pick a place and time and have a bunch of arrows with numbers showing the strength of the current.
That, of course, is pretty much PRECISELY what those "Old School" tidal current diagrams are, as you've pointed out...

Only difference is, they're on a printed page you already have aboard, instead of somewhere out in cyberspace, that requires an internet connection to view.... (grin)





I've yet to find an easier method to figure the optimal passage for Delaware Bay, for example, than this diagram below... Too bad NOAA stopped including these in their publications a couple of decades ago, hopelessly Old School, I suppose...

I wonder how much my laminated copy might fetch on eBay, these days?

Yeah, I think I already know the answer to that one...

Hmmm, on the other hand, perhaps if I could somehow turn it into an app only viewable on an iPhone, or require an internet connection? (grin)


07-01-2013 08:06 PM
downeast450
Re: Website with currents shown on chart with arrows

Quote:
Originally Posted by CalebD View Post
Stevens Institute shows info as you describe.
Believe it is just real time, as in what the current is doing right now.

http://hudson.dl.stevens-tech.edu/ma...ncontrol.shtml
Caleb,

Great source, Thanks! We have been finalizing plans for a paddle around Manhattan this August. It will be helpful.

Another one we use is PolarViewNS. http: polarnavy.com

The tide / current stations are displayed with real time current and direction along with Next Max Ebb time and current and Next Slack, Flood begins time with current. These are displayed as text with directional arrows. It is not an animation.

Wind speed / direction, wave height / direction, weather, etc. AIS, rout manager, etc.. All displayed on current chart. Very helpful tool. It includes information from ActiveCaptain POI, too. We do all our planning with it. Great tool. About $50.00 for 5 licenses. I use it on both Mac and PC laptops. All charts licenses come with it. Free trial is available. Worth a look.

Down
07-01-2013 06:54 PM
tommays
Re: Website with currents shown on chart with arrows

In NYC the Stevens web current uses and extensive network of current sensors as you go east in the sound the number of sensors drops dramatically and it becomes a computer model
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