This helps you make real-world assessments of the conditions you'll face. For example, "the current ebbs all afternoon; low tide is just after dark; there will be no moonlight until late... so we'll want to be in by about 6 to be sure we clear the shoals (remember that other time?) and still have enough light to see."

Other tide books just say:

Tidelog teaches.. without words! Watch the tidal rhythms change with the moon's phase, distance (apogee, perigee), and declination (north, south, over the equator). See the relationship between tides and currents; for example, low tide rarely corresponds to maximum ebb, nor even to slack before flood. (This is often news even to experienced boaters, but is simply a result of the inertia of moving water.)

Tidelog minimizes mistakes. Everyone makes them. We've seen even old hands misread a "bait-shop" tidebook: "Oh, I was reading the a.m. column and thought it was p.m.!"

Tidelog's graphics make it hard to go wrong. This is why Tidelog is favored not only among recreational boaters, but also by commercial, scientific, and industrial users. Repeat customers include many of the big names in shipping, tugboat, piloting, engineering, construction, flood control, pollution control, aquaculture, police, harbormaster, and other maritime professions.

Tidelogs are used to combat whale strandings on Cape Cod, to predict geothermal activity in California, to harvest geoducks in Washington state, and to locate fossils in Chesapeake Bay.

Tidelog is more than a tide book. Planetary positions, solstices, equinoxes, meteor showers, and eclipses have little to do with tides and currents, but they all add to our awareness and enjoyment of the natural world around us, and are noted when appropriate.