Speeds, course and altitudes in aviation

Interactive learning tool: see how IAS, TAS and GS differ, how heading and track relate to wind drift, and how AGL, AMSL and flight level work. Change sliders and presets to understand the concepts visually.

Learning presets

Low elevation, normal QNH - see AGL vs AMSL.

Speeds

IAS (indicated), TAS (true), GS (ground). Wind changes GS; altitude and temperature affect TAS.

IAS (kt)

Altitude (ft)

OAT (°C)

Wind speed (kt)

Wind direction (°)

Speed units

km/h

mph

Course (heading / track / drift)

Heading = where the nose points. Track = path over the ground. Drift = angle between them due to wind.

Heading (°)

Heading (°)360°

Track360°

Drift0°

Heights and altitudes

AGL = above ground. AMSL = above mean sea level. QNH sets the altimeter reference. FL = pressure altitude in hundreds of feet.

QNH (hPa)

Ground elevation (ft)

Indicated altitude (ft)

AGL - ft AMSL - ft FL -

Aircraft speeds, course and altitudes explained

Learn the difference between indicated, true and ground speed; how heading, track and drift relate; and how AGL, AMSL, QNH and flight level work. Interactive educational module for pilots.