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XTide provides tide and current predictions in a variety of formats. It can generate graphs, text listings, and calendars, or put a tide clock on your desktop. Xtide works through three separate programs: the X Windows interface (xtide), the non-interactive or command line interface (tide), and the web interface (xttpd). XTide uses the same algorithm to predict tides as the National Ocean Service in the U.S. It is much more accurate than a simple tide clock from a novelty store. However, to predict tides accurately you also need special data for every location for which you want to predict tides. XTide reads this data from harmonics files that you must get from Bob Kenney's web site, XTide's predictions are only as good as the available harmonics data. Due to issues of data availability and of compatibility with non-U.S. tide systems, predictions for U.S. locations tend to be much better than for locations outside of the U.S.


User FAQ available in HTML format from; User guide included and available in HTML format from


Download version 2.6.4 (stable)
released on 16 November 2003



LicenseVerified byVerified onNotes
GPLv2orlaterJanet Casey6 March 2002

Leaders and contributors

David Flater Maintainer
See Contributor

Resources and communication

Audience Resource type URI
Bug Tracking,Developer,Support E-mail

Software prerequisites

Kind Description
Weak prerequisite World Vector Shoreline Data (; Xtide 2.5 or later
Weak prerequisite *note* that this is a 41 meg file)
Required to use libXpm 4.3 or later (a.k.a. xpm-3.4)
Required to use libpng 0.96 or later
Required to use libz 1.0.4 or later (a.k.a. zlib-1.0.4)

This entry (in part or in whole) was last reviewed on 2 April 2004.


Permission is granted to copy, distribute and/or modify this document under the terms of the GNU Free Documentation License, Version 1.3 or any later version published by the Free Software Foundation; with no Invariant Sections, no Front-Cover Texts, and no Back-Cover Texts. A copy of the license is included in the page “GNU Free Documentation License”.

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