Pilotage is the use of fixed visual references on the ground or sea to guide oneself to a destination. Pilotage is used by people guiding vessels and aircraft, by hikers and SCUBA divers. There are other, more advanced methods of navigation using tools, such as compasses, maps, nautical chartes and ultimately satellite navigation systems like GPS.
Pilotage depends on the pilot being able to recognise the visual references in order to make use of them. The pilot must either be familiar with those visual references or be able to discover them from a map, aeronautical chart or nautical chart. Many nautical and aeronautical diasters have resulted from the pilot incorrectly identifying visual references and particularly natural features, which are difficult to recognise.
The term pilot refers to a person who is piloting and was originally used to describe navigators that would help steer ships into harbours (today known as a harbour pilot). Today it is more commonly used to refer to anyone who controls the flight of an aircraft.
Common types of visual reference point used for pilotage:
- During the day
- Natural features:
- Mountains, hills, lakes, rivers and coastal features such as cliffs, rocks and beaches
- Man made nautical features:
- IALA buoyage system, land marks and radio aerials
- Man made land features:
- Airports, cities, dams and highways
- At night
- Man made nautical features:
- Lighthouses, lightships and marks with lights
- Man made land features:
- Airports, illuminated towers and buildings
Pilotage is frequently combined with navigation techniques such as dead reckoning. When a pilot, at a known location, cannot see the next visual reference on the route to a destination, he or she can use dead reckoning to get closer to the next reference point. This is the most common form of VFR navigation.
