Yes, in the US (and presumably some other countries, I don't know of any offhand). Many other countries such as Canada use Lowest Astronomical Tide. The diffe

Yes, in the US (and presumably some other countries, I don't know of any offhand). Many other countries such as Canada use Lowest Astronomical Tide. The difference is actually important to know at times when boating between the countries. See https://en.wikipedia.org/wiki/Chart_datum#Choice_of_tidal_phase https://en.wikipedia.org/wiki/Chart_datum#Choice_of_tidal_ph...