Navigation lights and shapesQuestion 74 of 352

How wide is the arc of a sternlight?

  1. 135 degrees
  2. 112.5 degrees
  3. 225 degrees
  4. 360 degrees
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Correct answer: 135 degrees

A sternlight shows to the rear over 135 degrees.

Source: US Code of Federal Regulations (eCFR), 33 CFR Part 83: Inland Navigation Rules, § 83.21 Definitions (Rule 21)

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Questions last reviewed: 18 October 2026