What units are used when transmitting line 4 of the 9 line CAS briefing?

Line 4 of the 9 line Close Air Support (CAS) briefing specifically requires reporting the target elevation in feet above mean sea level (MSL). This unit is preferred because it provides a clearer and more standardized understanding of the target's height relative to sea level, which can be crucial for aerial operations and safety.

Using feet allows for precise communication among joint and coalition forces who are accustomed to this measurement system. It also simplifies coordination with aircraft that operate using feet for altitude, ensuring all parties have a consistent framework for understanding target elevation.

Other units, such as meters or inches, might be less familiar or may introduce conversion errors. In military operations, particularly in air support, providing information in a standard format is essential for operational effectiveness and safety, which is why the use of feet above MSL is established as a standard practice in CAS briefings.