High Intensity Radio Transmission Area. An area that can interfere with your drone electronics.

Global Positioning System. A collection of satellites that work together to allow the position of the drone to be calculated

Geographical Information System. The system that captures and stores geographical data to allow it to be manipulated and presented in various ways.

Flight Restricted Zone. Areas where flights require special or additional permissions from the relevant authorities such as the areas surrounding airfields.

First Person View. A forward facing camera on the drone allows the pilot to fly as if they are actually on board the aircraft - a technique commonly used in drone racing.

Field of View. The amount of environment visible through the camera lens.

Flight Level. A surface of constant atmosphere pressure which is related to a specific pressure datum, 1013.2hPa, and is separated from other such surfaces by specific pressure intervals. Altitude above sea-level in 100 feet units measured according to a standard atmosphere

Flight Controller - the drone's brain which is used to stabilise and control the aircraft.

Federal Aviation Administration. The CAA equivalent in the USA overseeing civil aviation.

Extended Visual Line of Sight. A distance of over 500 metres which is the standard range of Visual Line of Sight where the pilot can extend the range by using a second spotter to watch the aircraft and communicate with the pilot.