Cruisers Forum

Join CruisersForum Today

Thread Tools Search this Thread Rate Thread Display Modes
Old 04-10-2011, 12:16   #16
Senior Cruiser
GordMay's Avatar

Cruisers Forum Supporter

Join Date: Mar 2003
Location: Thunder Bay, Ontario - 48-29N x 89-20W
Boat: (Cruiser Living On Dirt)
Posts: 38,198
Images: 241
Re: Time and Tide Clocks

Originally Posted by GordMay View Post
This map shows the geographic distribution of different tidal cycles. ..
A better tide map from:
8(r) Ocean Tides
Attached Thumbnails
Click image for larger version

Name:	TidesMap.gif
Views:	82
Size:	69.1 KB
ID:	32349  

Gord May
"If you didn't have the time or money to do it right in the first place, when will you get the time/$ to fix it?"

GordMay is offline   Reply With Quote
Old 04-10-2011, 12:19   #17
CF Adviser
Bash's Avatar

Join Date: Dec 2008
Location: sausalito
Boat: 14 meter sloop
Posts: 7,260
Re: Time and Tide Clocks

Originally Posted by DJBrookster View Post
Sorry but there seems to be an under current of reliance on electrical equipment. Plotters and apps are great but can always let you down.
Let's see, on my boat there are two chart plotters backed up by two handheld gps systems backed up by two VHF radios (in our areas the tides are broadcast on NOAA weather radio channels), backed up by an iPhone and a Blackberry, both equipped with tide apps. I've got eight electronic instruments on which I can retrieve tidal data without having to resort to an archaic table incapable of adjusting tides for exact locations in exact times.


The tidal data on the paper tide charts is only good for the current year and doesn't extend more than 100 miles from here. The tidal data on my iPhone extends well beyond my expected lifetime and covers every tidal station on the west coast from Canada through Mexico, and every one of the 50 states that comprise the United States of America. American Samoa is in there too, I've just noticed.

That little paper chart is sitting in the chart table in my nav station, which is inaccessible to me at the moment since I'm in my office. However, I can use the iPhone right now to tell me the exact tidal stage the moment I'm planning to leave the dock this weekend, down to the inch.

When they stop giving out those paper chart books free at chandleries, I won't miss them for a minute. I certainly wouldn't waste hard-earned money on one.

cruising is entirely about showing up--in boat shoes.
Bash is offline   Reply With Quote
Old 04-10-2011, 13:45   #18
Registered User
roger.waite's Avatar

Join Date: Jul 2008
Location: Plimmerton, New Zealand
Boat: Samsara, a Ross 930
Posts: 380
Re: Time and Tide Clocks

An example from my area showing why tables, charts, and height and flow predictions (paper-based or gizmo-based) should be used with an eye on weather conditions, and what is actually happening ...

"The tidal flow through Cook Strait is unusual. On each side of the strait the tide is almost exactly out of phase, so high water on one side meets low water on the other. Strong currents result, with almost zero tidal height change in the centre of the strait. Although the tidal surge should flow in one direction for six hours and then the reverse direction for six hours, a particular surge might last eight or ten hours with the reverse surge enfeebled. In especially boisterous weather conditions the reverse surge can be negated, and the flow can remain in the same direction through three surge periods and longer. This is indicated on marine charts for the region.[10]
"There are numerous computer model representations of the tidal flow through Cook Strait. While the tidal components are readily realizable,[11] the residual flow is more difficult to model.[12]


roger.waite is offline   Reply With Quote

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not 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 Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Cairns to Perth Part 1 Bartlettsrise Sailor Logs & Cruising Plans 1 10-09-2011 23:38
Tide / Current Predictions in Caribbean kiltym Navigation 0 04-09-2011 09:39
Maine Schooner Aground for 2nd Time this Summer Soundbounder General Sailing Forum 2 02-08-2011 13:54

Advertise Here

All times are GMT -7. The time now is 11:52.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.