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NOTE. The license and disclaimer appearing below applies to the XTide program itself. For information about permissions on the harmonic constants, see https://flaterco.com/xtide/harmonics_boilerplate.txt.
This software is provided under the terms of the GNU General Public License, either version 3 of the License, or (at your option) any later version.
Although the package as a whole is GPL, some individual source files are public domain. Consult their header comments for details.
This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. The author assumes no liability for damages arising from use of this program OR of any 'harmonics data' that might be distributed with it. For details, see the appended GNU General Public License.
(Accurate tide predictions can only be made if the 'harmonics data' for the relevant location are good. Unfortunately, the only way the maintainer of those data has of knowing when they are bad is when someone with access to authoritative tide predictions or observations reports a problem. You should not use this program or any data files that might be distributed with it if anyone or anything could come to harm as a result of an incorrect tide prediction. NOAA and similar agencies in other countries can provide you with certified tide predictions if that is what you need.)
XTide's predictions do not incorporate the effects of tropical storms, El Niño, seismic events, subsidence, uplift, or changes in global sea level.
The tide prediction algorithm used in this program was developed with United States Government funding, so no proprietary rights can be attached to it. For more information, refer to the following publications:
Manual of Harmonic Analysis and Prediction of Tides. Special Publication No. 98, Revised (1940) Edition (reprinted 1958 with corrections; reprinted again 1994). United States Government Printing Office, 1994.
Computer Applications to Tides in the National Ocean Survey. Supplement to Manual of Harmonic Analysis and Prediction of Tides (Special Publication No. 98). National Ocean Service, National Oceanic and Atmospheric Administration, U.S. Department of Commerce, January 1982.
Version 3, 29 June 2007
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