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Notes from the harbor

How the tables are made, and how crews read them.

Windows · 3 min read

A tide window is a promise

Why the API answers with the hours a draft clears, and never with a table to read by hand.

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Topics

What the notes cover.

Tides

How a berth’s tide differs from its station’s.

Datums

Which zero a height stands on, and why it matters.

Windows

The hours a keel clears, computed per berth.