the author of this app says:
This program offers tide tables for your Palm(tm) handheld! No more checking the paper before you head to the beach!
The program includes both a Macintosh application and a Windows application for converting tide tables, which can be downloaded from the Web and into Palm-handheld databases.
Version 1.2 adds support for sunrises, sunsets and moon phases.
Must load a tide table first.