Displays a graphical representation of the tides

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+xtide is a program which predicts and displays tides.  It is capable of
+producing output in a variety of dynamic and static formats, and has
+extensions for X, plain ASCII, and HTML.
+
+You may need to replace the harmonics file used by this port by one
+better suited to your area; there are a number of harmonics files
+available at http://www.universe.digex.net/~dave/files/.  You will
+also have to specify your location either by setting the LOCATION
+environment variable, by using the -location script, or by creating
+an appropriate ~/.xtiderc. 
+
+http://www.universe.digex.net/~dave/xtide/xtide.html has complete
+documentation, or just read the man page.
+
+- Brion Moss
+brion@queeg.com