How to find tide current direction? - Page 2 - SailNet Community
Seamanship & Navigation Forum devoted to seamanship and navigation topics, including paper and electronic charting tools.

Reply
 
LinkBack Thread Tools
post #11 of 20 Old 08-25-2007
Senior Member
 
Join Date: Jul 2007
Posts: 343
Thanks: 0
Thanked 1 Time in 1 Post
Rep Power: 0
 
I find that Reeds and Eldridges are not always 100% accurate and certainly miss a lot of local currents and eddies as well. I would think that real time data could improve this.

jef
sv shiva
SanderO is offline  
Quote Quick Reply Share with Facebook
Sponsored Links
Advertisement
 
post #12 of 20 Old 08-25-2007
Senior Member
 
Join Date: Aug 2006
Location: Arlington, VA
Posts: 1,854
Thanks: 0
Thanked 11 Times in 9 Posts
Rep Power: 11
   
Arrow Sometimes It's the Current Not the Tide Level

A problem with many tide programs is that they only give you part of the information you need.

For example, while it's nice to know the time of high or low tide, sometimes what you really want to know is the time of slack water (no tidal current), and this may vary quite a bit from the time of high or low tide.

Example: today, August 25, 2007, here are the predicted times of high and low tides, and the corresponding local times (EDT) of slack water for the Washington Channel:

High Water...............0551
Slack Water.............0700

Low Water...............1321
Slack Water.............1424

High Water...............1835
Slack Water.............1855

While it doesn't much matter in this particular location, it could matter A LOT in places like the C&D Canal or the Cape May Canal or The Race or Hell Gate. In these places, and many others, it's the CURRENT you care about, not the height of the tide.

Bill
btrayfors is offline  
Quote Quick Reply Share with Facebook
post #13 of 20 Old 08-25-2007
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 16
     
Sometimes height of tide is important too! (G)
camaraderie is offline  
Quote Quick Reply Share with Facebook
post #14 of 20 Old 08-25-2007
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
       
Let us not get overly obsessed with real time data (where's the funding for that?) and on line availability. The nature of the beast is that the tide and current tables are accurate as far as they go. But a couple of days of 20 kt plus on shore winds is going to effect them and you're going to have to know how it will.
It is best to treat such tables as good estimates, subject to a lot of variables. Otherwise you might find yourself declaring the tide on the ebb, only to have your AB seaman flick a butt over the side and proclaim, "looks like she's floodin' to me, mate."

“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.
sailaway21 is offline  
Quote Quick Reply Share with Facebook
post #15 of 20 Old 08-25-2007
Senior Member
 
Join Date: Aug 2006
Location: wherever
Posts: 5,283
Thanks: 8
Thanked 17 Times in 16 Posts
Rep Power: 12
     
Quote:
Originally Posted by camaraderie View Post
Nah...just take this URL and download your own windows tides and current predictor for anywhere. FREE!
http://www.wxtide32.com/
Cam
Did the download of wxtide32, I don't see the current predictor, only the tide. What am I missing?
xort is offline  
Quote Quick Reply Share with Facebook
post #16 of 20 Old 08-25-2007
moderate?
 
camaraderie's Avatar
 
Join Date: May 2002
Location: East Coast
Posts: 13,877
Thanks: 0
Thanked 3 Times in 3 Posts
Rep Power: 16
     
Only current stations show currents. In the locator window you must chek "show current stations" . Then they will show up with a LARGE C or a small c in parentheses in the listing. Try looking for Massachusetts/Cape Cod Canal for an example of one. Hope that is understandable.

How to find tide current direction?-currents.gif
camaraderie is offline  
Quote Quick Reply Share with Facebook
post #17 of 20 Old 08-26-2007
Senior Member
 
Join Date: Aug 2006
Location: wherever
Posts: 5,283
Thanks: 8
Thanked 17 Times in 16 Posts
Rep Power: 12
     
Thanks Cam
It appears, from a quick scan, that there are many more tide stations than current stations. There were only a few currents for all of Florida.
Moving from fresh water to salt will be a treat!
xort is offline  
Quote Quick Reply Share with Facebook
post #18 of 20 Old 08-28-2007 Thread Starter
Junior Member
 
Join Date: Jun 2007
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Quote:
Originally Posted by sailingdog View Post
From the Wxtide32 website:



[/B]Get and use Eldridge's or Reeds... neither requires a computer or anything more than a clock, and the ability to read. [/COLOR]
I can predict the moon position with great precission. Based on this I can predict tide levels. And Garmin BlueCharts has this shown. Why they do not want to show predicted currents? How is there difference in predicting water level from tide current? simply said current = d level / d t.
I know, that many people prefer paper charts to the GPS navigation, but this is different point.
eamnesia is offline  
Quote Quick Reply Share with Facebook
post #19 of 20 Old 08-28-2007 Thread Starter
Junior Member
 
Join Date: Jun 2007
Posts: 3
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 0
 
Quote:
Originally Posted by camaraderie View Post
Only current stations show currents. In the locator window you must chek "show current stations" . Then they will show up with a LARGE C or a small c in parentheses in the listing. Try looking for Massachusetts/Cape Cod Canal for an example of one. Hope that is understandable.

Attachment 523
great. thanks will do.
eamnesia is offline  
Quote Quick Reply Share with Facebook
post #20 of 20 Old 08-28-2007
Owner, Green Bay Packers
 
Join Date: Sep 2006
Location: SW Michigan
Posts: 10,318
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 12
       
eamnesia,
I believe the concept you are struggling with is that tides and tidal currents do not act in a linear fashion in their rate of change from point to point. bottom characteristics as well as shape of land all effect them greatly. then you can toss in wind and so forth to vary even that.

“Scientists are people who build the Brooklyn Bridge and then buy it.”
Wm. F. Buckley, Jr.
sailaway21 is offline  
Quote Quick Reply Share with Facebook
Reply

Quick Reply
Message:
Options

By choosing to post the reply above you agree to the rules you agreed to when joining Sailnet.
Click Here to view those rules.

Register Now



In order to be able to post messages on the SailNet Community forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
Please note: After entering 3 characters a list of Usernames already in use will appear and the list will disappear once a valid Username is entered.


User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Forum Replies Last Post
FYI - Freeware Tide Tool V2.2 is now in Tide Tool Beta 2.3 (Runs on NewsReader Mass Bay Sailors 0 03-03-2007 04:15 PM
Understanding Rogue Waves Brian Hancock Seamanship Articles 0 08-14-2003 08:00 PM
Understanding Apparent Wind Steve Colgate Learning to Sail Articles 0 11-10-2002 07:00 PM
That Damn Tide John Rousmaniere Seamanship Articles 0 09-13-2001 08:00 PM
Strait of Gibraltar Strategies Paul & Sheryl Shard Cruising Articles 0 06-19-2000 08:00 PM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome