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Avoiding Prison(s)

Working with HM Prison Service, we are pleased to announce the general availability of our UK Prisons datasets to our apps, maps and developer platform APIs. This means it is now easy for drone pilots to identify prisons and other HM Prisons facilities. Connected drones and flight planning apps using our geofencing platform will automaticallyreceive the new areas and help you avoid them.

It may come as a surprise, however, only a few prisons in the United Kingdom are actually covered by specific regions of regulated airspace which would prohibit flight over them. Other than conditions otherwise stipulated within the Air Navigation Order, this means there are no specific aerial restrictions in force. In addition, as many UK prisons are located within relatively dense urban environments, creating ‘arbitrary’ circular restricted areas over them would potentially impact those flying legally nearby, caught up in the catchment area of the circle.

Introducing Prison Land Boundaries

To help you identify UK prisons, we have taken the land boundary of the prison and inflated it by 50 metres – the distance the Air Navigation Order requires you to keep from buildings or structures that are not under your control (of course, if you are a licensed commercial drone pilot and you do have such permission, you will be able to ‘filter’ the prison zones from view).

The example below shows a UK prison overlaid on to our Ordnance Survey base map – a really popular choice for those flying in the UK:

An example of a UK prison on our web drone safety map, showing the land boundary inflated by 50 metres to ensure compliance with the Air Navigation Order

Clicking on the prison will yield further guidance:

Note: we have listed all HM Prisons (and related facilities) as ‘red zones’ on our map, to indicate that the area is a ‘high risk’ zone, and that flight of your drone might be hazardous and/or prohibited.

Altitude Angel

Altitude Angel

Altitude Angel is an aviation technology company delivering solutions which enable the safer integration and use of fully automated drones into airspace. Through its Airspace Management platform, GuardianUTM O/S, they deliver the essential software platform which enable national deployments of USpace compatible services, safely unlocking the potential of drones and helping national aviation authorities and air navigation service providers to establish new services to support the growth in the drone industry.  

The foundation components of GuardianUTM O/S are also available to enable third-party UTM developers, drone manufacturers and software developers to incorporate enterprise-grade data and services into their UTM solutions.  

Altitude Angel was founded by Richard Parker in 2014 and is headquartered in Reading, UK.  

Altitude Angel’s developer platform is open and available to all at


For further information please contact:

Stephen Farmer, Altitude Angel, Head of Corporate Communications & PR

+44 (0)118 391 3503

[email protected]