MCALMS Instrument Ground School Practice Test 2025 - Free Instrument Ground School Practice Questions and Study Guide

The Minimum Obstruction Clearance Altitude (MOCA) is a crucial concept in aviation that defines the minimum altitude for navigation signal coverage in a specific area. The primary purpose of MOCA is to ensure that an aircraft maintains a safe altitude above obstacles while also being within the range of navigational signals, which is essential for accurate navigation and communication.

In terms of navigational signal coverage, MOCA provides a defined radius around a VOR (VHF Omnidirectional Range) or other navigational aids. Specifically, the MOCA guarantees this signal coverage for a distance of 22 nautical miles from the navigational aid, making option B the correct choice. This coverage radius not only assists pilots in ensuring they are on course while minimizing the risk of terrain or obstruction impacts, but it also enhances overall flight safety by ensuring reliable navigation during the flight.

Understanding the significance of this coverage area is vital for pilots, as it helps them determine the minimum altitude they should fly to receive adequate navigational signals while avoiding terrain hazards.