What is the typical service volume of a Locator Outer Marker (LOM)?

The Locator Outer Marker (LOM) is designed to provide distance information to pilots during the approach phase of flight, particularly during an instrument approach. The typical service volume of a LOM is up to 15 nautical miles. This range allows for adequate coverage for aircraft as they approach the airport, helping pilots determine their position relative to the final approach fix and providing guidance for the descent profile.

The LOM is often associated with non-precision approaches and can serve as an intermediate step in transitioning from enroute navigation to the final approach phase. The 15-nautical-mile range is based on operational requirements and the technology used in radio navigation, ensuring that the marker is effective for the intended purpose.

Understanding the service volume is crucial for flight planning and approach procedures, as it affects how and when pilots can expect to receive marker signals during their approach. This knowledge allows instructors to effectively convey the importance of markers in the instrument flight rules (IFR) system, enhancing student understanding of navigation aids in aviation.