Note to Users in Certain Countries:
With version 2.2, Tide Tool has restored 44 locations in the U.K. Unfortunately it is still not permitted at this time to furnish tidal predictions for locations in Ireland and a few other locations worldwide.
|Please read this entire page, including the FAQ below, before emailing me. You will save us both some time. I have no further information beyond what is here.|
|The U.K. Hydrographic Office
has taken the position that our use of their tidal
information "infringes the intellectual property of
the Crown". After a long and fruitless discussion
with their bureaucrats, I have removed from Tide Tool all
locations in the British Isles, as well as 42 other locations throughout the
world (see list below).
The U.K.H.O. asserts ownership of tidal data at a long list of locations worldwide. Initially they claimed data for such locations as Hawaii, but after discussion their list has been somewhat reduced. However, it is no longer useful to argue with them. If you are interested in restoring a location, read on.
Fortunately, another agency of Her Majesty's government was able to provide tidal measurements from which 44 locations in the U.K. have been restored to Tide Tool beginning with version 2.2.
Unfortunately no data was available for the Republic of Ireland, or for the other tical locations around the world for which the U.K.H.O. claims ownership of the data.
If you are a British subject and do not support this action by your government, you may wish to make your opinion known to your M.P. You may also wish to write to the Ministry of Defence, of which the U.K.H.O. is a part.
If you are a resident of another country and wish your location restored, you can help. Contact the authorities in your country who are responsible for tides. Ask them if they can provide harmonic tidal constituents and offsets for locations in your country, for use in a free tide prediction program. Alternatively, ask if they will grant permission for the use of tidal constituents for your country which appeared in the out-of-print publication Table des Marees des Grands Ports du Monde, published by the French Hydrographic Office (S.H.O.M.) based on data from the International Hydrographic Organization database. If you are able to obtain that permission, email me and I will see that the locations are entered into Tide Tool.
The attitude of the U.K.H.O. is inconsistent with that of many other governments. The U.S. government makes all its harmonic constants available freely on the N.O.A.A. web site. The Dutch government recently cooperated with us to make their data sites in the North Sea available.
This action by the U.K.H.O. also affects on-line tide prediction sites using the XTide program, which is the source of the data used in Tide Tool. For details of the correspondence with U.K.H.O. see Dean Pentcheff's tide prediction site.
Will the data files from earlier versions of
Tide Tool work with current versions of the program?
U.K.H.O. offers to license their harmonic data. Why don't
you negotiate a license?
that's all changed. The new, friendly U.K.H.O. now offers royalty-free
licenses to reproduce their stuff.
Can I generate my own British Isles database
to work with Tide Tool?
Can you send me a copy of one of the earlier
versions of Tide Tool?
Can you secretly send me a copy of one of the earlier
versions of Tide Tool? I will pay. I promise not to tell anyone. (Yes, this is a frequently asked question. Sigh.)
Can you tell me where to find an earlier
version of Tide Tool that covers my area?
Why are you so grumpy about all this?
Back to Tide Tool home page.
Page last modified December 4, 2003
Locations outside the British Isles claimed by the U.K.H.O:
Ad Dawhah, Qatar
Bandar Abbas, Iran
Bandar-e Lengeh, Iran
Colombo, Sri Lanka
Dar Es Salaam, Tanzania
Green Turtle Cay, Bahamas
Hillsborough, Carriacou, The Grenadines
Jazirat Das, U.A.E.
Jazirat Halul, Qatar
Kilindini Harbour, Kenya
Ko Si Chang, Thailand
Kota Kinabalu, Malaysia
Little Inagua Island, Bahamas
Mina Al Ahmadi, Kuwait
Mina Salman, Bahrain
Mina Zayed, U.A.E.
Neiafu, Vava`u Group, Tonga
Pointe des Galets, Reunion
San Carlos, Equatorial Guinea
Steventon, Great Exuma Island, Bahamas
Surabaya, Java, Indonesia
Tailevu, Fiji Islands
Umm al Hatab, U.A.E.