How frequently do pilots report their position in terms of longitude?

Pilots typically report their position in terms of longitude at intervals of 10 degrees. This frequency strikes a balance between providing enough data for air traffic control to maintain situational awareness and ensuring that reporting remains manageable for pilots. When flying long distances, reporting at every 10 degrees allows for sufficient updates on position without overwhelming either the pilot or the air traffic controllers.

Smaller intervals, such as every 5 degrees, would lead to excessive communication and could cause congestion on the frequency, making it difficult to maintain clarity and efficiency in communications. On the other hand, larger intervals, such as 15 or 20 degrees, would provide less information, potentially reducing situational awareness and safety. Thus, reporting every 10 degrees is considered the most effective approach for both safety and operational efficiency in aviation.