Q-codes

Three-letter codes from the Morse era that are still used on the radio. The common ones:

• QNH: altimeter setting for altitude above mean sea level
• QFE: altimeter setting for height above the aerodrome
• QDM: magnetic heading to steer to reach the station, with no wind
• QDR: magnetic bearing from the station to you
• QTE: true bearing from the station to you

A pilot unsure of their position can ask a direction-finding station “request QDM”.