Warning area starting distance from the coast

Remote Pilot (Part 107) practice question 12 of 21 on Airspace / Classification. ACS element UA.II.A.K2 · difficulty: recall. Want to answer it in a timed quiz? Use the Remote Pilot (Part 107) practice mode.

Question bank updated 2026-09-22

QUESTIONA warning area is airspace of defined dimensions that extends outward from the coast of the United States beginning at what distance?

A12 nautical miles
B3 nautical miles
C5 statute miles from the shoreline

Show the answer and explanation

Correct answer: B. 3 nautical miles

A — incorrect The study guide gives 3 NM, not 12 NM, as the distance from the coast where warning areas begin.
B — correct The study guide describes a warning area as extending from 3 NM outward from the coast of the United States.
C — incorrect Warning areas are described in nautical miles starting at 3 NM; a 5 statute mile figure does not appear in the source.

BACKGROUND

Warning areas are similar in nature to restricted areas, but the United States government does not have sole jurisdiction over the airspace. A warning area is airspace of defined dimensions, extending from 3 nautical miles (NM) outward from the coast of the United States, that contains activity which may be hazardous to nonparticipating aircraft. Its purpose is to warn nonparticipating pilots of the potential danger. A warning area may lie over domestic or international waters or both, and it is designated with a 'W' followed by a number, such as W-237.

STUDY TIP

Remember warning areas by three facts: they begin 3 NM offshore, the U.S. lacks sole jurisdiction, and they are labeled 'W' plus a number.

KEY POINTS

Warning areas begin 3 NM outward from the coast.
The U.S. government does not have sole jurisdiction over them.
They are charted as 'W' followed by a number.

SOURCES

remote_pilot_study_guide.txt Chapter 2 "Warning Areas"

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