provides tide and current predictions GtkTide is a package that provides tide and current predictions in a wide variety of formats. Graphs, text listings, and calendars can be generated. The algorithm that XTide uses to predict tides is used by the National Ocean Service in the U.S. It is significantly more accurate than the simple tide clocks that can be bought in novelty stores. However, it takes more to predict tides accurately than just a spiffy algorithm -- data are required for every tidal prediction location. Web Page: http://mike.yi.org/projects/gtktide/