Aircraft navigation is the science of knowing where an airplane is, where it needs to go, and how to get there safely. Pilots use a combination of visual landmarks, compass directions, timing, radio signals, and satellites to follow a planned route. This matters because aircraft move fast, weather can hide the ground, and airspace is crowded.
Good navigation keeps flights efficient, predictable, and separated from hazards.
Key Facts
- Ground speed = distance ÷ time, so distance = ground speed × time.
- Dead reckoning estimates position using heading, speed, time, and wind correction.
- A heading is the direction the aircraft nose points, while a track is the actual path over the ground.
- VOR stations transmit radio radials that let pilots fly toward or away from a known ground location.
- ILS guidance has two main parts: the localizer for left and right alignment and the glideslope for descent angle.
- GPS position is found by measuring distances to multiple satellites and solving for location and time.
Vocabulary
- Pilotage
- Pilotage is navigation by comparing visible landmarks such as rivers, roads, towns, and coastlines with a map.
- Dead reckoning
- Dead reckoning is estimating a current position from a known starting point using direction, speed, time, and wind.
- VOR
- VOR is a ground-based radio navigation system that helps aircraft determine their direction from a station.
- ILS
- ILS is an instrument landing system that guides an aircraft horizontally and vertically toward a runway.
- GPS
- GPS is a satellite navigation system that provides position, speed, and time information to aircraft receivers.
Common Mistakes to Avoid
- Confusing heading with track: heading is where the nose points, but wind can push the aircraft so its track over the ground is different.
- Ignoring wind in dead reckoning: wind changes both ground speed and direction, so a time and compass calculation without wind correction can place the aircraft far off course.
- Thinking GPS is the only navigation method: pilots and aircraft systems often cross-check GPS with maps, instruments, radio navigation, and air traffic control instructions.
- Treating an ILS as general route navigation: ILS is mainly for the final approach to a runway, not for navigating the whole flight from city to city.
Practice Questions
- 1 An aircraft flies with a ground speed of 180 knots for 30 minutes. How far does it travel in nautical miles?
- 2 A pilot plans to fly 240 nautical miles at a ground speed of 120 knots. How many hours will the trip take, and how many minutes is that?
- 3 A plane is pointed north with a heading of 360 degrees, but a strong wind from the west pushes it east of its planned path. Explain why the heading and track are different and name one correction the pilot could make.