High Frequency communication is described as enabling pilots to report position at every 5-degree longitude change.

High Frequency communication is described as enabling pilots to report position at every 5-degree longitude change.

• A. Every 1 degree
• B. Every 5 degrees
• C. Every 10 degrees
• D. Every 15 degrees

Answer: (B)

In long-range operations where radar coverage isn’t available, HF radio lets pilots stay in contact with ATC and provide position updates using a geographic reference rather than time. Reporting at every 5-degree change in longitude gives a practical, predictable cadence that keeps ATC aware of progress along the route without overloading the system with too many reports. If you reported every degree, it would be burdensome for both pilots and controllers; if you waited 10 or 15 degrees, there could be larger gaps in tracking, reducing situational awareness on remote legs. So, the standard interval is every 5 degrees of longitude.

In long-range operations where radar coverage isn’t available, HF radio lets pilots stay in contact with ATC and provide position updates using a geographic reference rather than time. Reporting at every 5-degree change in longitude gives a practical, predictable cadence that keeps ATC aware of progress along the route without overloading the system with too many reports. If you reported every degree, it would be burdensome for both pilots and controllers; if you waited 10 or 15 degrees, there could be larger gaps in tracking, reducing situational awareness on remote legs. So, the standard interval is every 5 degrees of longitude.