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Tide clock and tide predictor

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, http://flaterco.com/xtide/files.html. 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.



Verified by

Verified on


Verified by

Janet Casey

Verified on

6 March 2002

Leaders and contributors

See Contributor
David Flater Maintainer

Resources and communication

AudienceResource typeURI
Bug Tracking,Developer,SupportE-mailmailto:software@flaterco.com

Software prerequisites

Required to uselibXpm 4.3 or later (a.k.a. xpm-3.4)
Weak prerequisiteWorld Vector Shoreline Data (http://www.flaterco.com/xtide/files.html; Xtide 2.5 or later
Weak prerequisite
  • note* that this is a 41 meg file)
Required to uselibpng 0.96 or later
Required to uselibz 1.0.4 or later (a.k.a. zlib-1.0.4)


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