XTide downloads

Warning for Windows users

XTide was designed for Unix and X11, not Microsoft Windows.  If you want to try to use it under Windows anyway, there's a precompiled binary for the command-line client, and there are also some ports.  However, these are all supported by their respective maintainers.  Please route support questions accordingly.


The archive is at https://flaterco.com/files/xtide/.  Old links pointing to ftp://ftp.flaterco.com/xtide/... should be redirected to https://flaterco.com/files/xtide/....

Harmonics files

If you are looking for data for countries other than the US, read this FAQ.

filebuilt withworks withdescription
harmonics-dwf-20240104-free.tar.xzlibtcd 2.2.7-r3XTide 2.8+All data for the US and associated locales available from the National Ocean Service web site as of 2023-12-23.  List of included locations
harmonics-dwf-20240104-SQL.tar.xzPostgreSQL 16.1Harmbase2Dump of Harmbase2 database.

Beginning with the 2023 refresh, please note that the SQL dump now includes the database creation commands, and it is no longer necessary or advisable to createdb harmbase2 before loading it.

libtcd source code distribution

XTide source code distribution

It has become popular among app developers to derive works from the ancient final release of XTide version 1 because the C code of XTide 1 is simpler.  Cosmetic issues aside, XTide 2 implements a better algorithm for estimating water levels at subordinate stations and correctly handles more of the unusual cases.

World Vector Shoreline data

World Vector Shoreline data for optional use with XTide 2.5 or newer.

These files were published on the National Geophysical Data Center (NGDC) 5-Minute Gridded Global Relief Data CD-ROM (ETOPO5), 1993, and are public domain.  They are available from NOAA at https://www.ngdc.noaa.gov/mgg/global/relief/ETOPO5/BOUNDARY/WVS (see here for related information).  If the files are obtained from NOAA, the filenames must be changed to all lowercase letters to work with XTide.


This package contains extra scripts to do fast and dangerous GCC builds of all XTide-related packages on particular flavors of Linux as well as build scripts for Android, DOS, Windows, and Cygwin.

Contrib packages and patches

Things that disappeared (links to archive.org):


For experts


Other materials:

See also the IHO list of constituents in the next section.

Miscellaneous government publications

IHO list of constituents, downloaded from http://www.iho.shom.fr/COMMITTEES/TC/Constituents.pdf on 2004-08-13 and 2006-08-25, and from https://www.iho.int/mtg_docs/com_wg/IHOTC/IHOTC_Misc/TWCWG_Constituent_list.pdf on 2018-01-01.

Link:  NOS popular publications page

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.  Downloaded from NOAA Central Library via NOAA's Historical Map & Chart Collection, 2015-04-27.

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.  Downloaded from NOS, 2016-12-18.

Tide and Current Glossary.  National Ocean Service, January 2000.  Downloaded from NOS, 2003-12-19.

Tidal Datums and their Applications.  NOAA Special Publication NOS CO-OPS 1, June 2000.  Downloaded from NOS, 2004-08-27.

Computational Techniques for Tidal Datums Handbook.  NOAA Special Publication NOS CO-OPS 2, September 2003.  Downloaded from NOS, 2007-03-01.

Tidal Analysis and Prediction.  NOAA Special Publication NOS CO-OPS 3, July 2007.  Downloaded from NOS, 2014-12-28.

Originally by Nathaniel Bowditch, LL.D.  The American Practical Navigator:  An Epitome of Navigation.  NIMA Pub. No. 9.  These and other editions are available from NGA: