USA Onboard · Field Guide

Nighttime Navigation.

An ocean that fades into a single tone, lights that mean things, distances that no longer behave — a working guide to the hours when the water teaches everyone to look twice.

Download the guide free below

A boat at night becomes a different boat. Color disappears from the water, and the world is reduced to a small constellation of lights whose meanings are not optional.

Boating after sunset rewards the prepared and humbles everyone else. The discipline is not difficult, but it is unforgiving of improvisation — and almost all of it is decided before the engine starts. The lights of other vessels are a language. The instruments confirm what the eye can no longer trust. And the float plan left on shore is the single thing that finds a boat that does not arrive.

This guide reads them all the way a captain does, drawing on the U.S. Coast Guard Navigation Rules and the COLREGS — written to be read calmly now and remembered instantly later, when the dark hour earns the preparation.

What's inside the guide
  • What the dark actually changes — night vision, false distances, and the twenty-minute rule that protects them
  • Reading lights, not landscapes — buoy cadences (Fl, Q, Iso, Mo) and the navigation lights of every vessel you'll meet
  • The case for instruments — GPS, chartplotter, AIS, radar, and the compass that never fails
  • Visibility both ways — being seen, seeing the water, and reading vessels by COLREGS Part C
  • Planning & crew — the float plan, watch rotation, and the speed the night allows
  • A full quick-reference card and the do / don't of the dark
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