Tide Tool is a freeware program for Palm handheld computers which
computes tides and currents worldwide. It also does sunrise/sunset
and moon phases. It runs on all palmtop computers using the Palm OS,
including the Handspring Visor.

The 2.0 version, now available in beta, triples the number of
locations, to over 6000, adds a graph mode, and runs faster.

For details or download, go to
http://www.toolworks.com/bilofsky/tidetool.htm and
click the beta link.