I also used it to establish the approximate tidal range in the Philippines for a prospective project. My brother in Wales uses Tide Tool to time trips to the beach so his wife can ride her horse on the sands. Tide Tool has become a permanent addition to my PalmPilot. It's best during a week when low tide is in the afternoon. At low tide, the beach is wider and waves calmer, perfect for my two toddlers to play on the beach.
Many colonies are only accessible at low tide.
I was recently given your email by the U.S. Coast Guard to obtain a tidal cycle application to put into my Palm Pilot. I am an avid surfer and fisherman and rely on tidal data to plan my recreational activities. Moving submarines into and out of drydock, we need to know which days will produce enough tide, and what time, so that docking evolutions can be scheduled, planned, and executed. The rapid currents often require certain craft movements be done at slack water. Even when we're not moving submarines around, there are few things as bothersome as walking out to inspect the pier and finding out that it's high tide when I get there.