What are the two main radio aids likely to be seen at Royal Air Force airfields?

The two main radio aids likely to be seen at Royal Air Force airfields are indeed the Digital Resolution Direction Finding (DRDF) and the Instrument Landing System (ILS).

The Digital Resolution Direction Finding system is a crucial tool that helps in locating the direction of radio signals, which is particularly beneficial for search and rescue operations, air traffic control, and navigation. This system enhances situational awareness and helps in accurately tracking aircraft locations.

The Instrument Landing System is fundamental for ensuring safe landings, especially in conditions of poor visibility. ILS provides pilots with guidance on the correct approach path and descent angle to the runway. This approach is critical for maintaining safety during landing procedures, making it an essential component of aviation operations at military airfields.

While the other options include radio and communication technologies that are present in aviation, they do not represent the primary radio aids used specifically at Royal Air Force airfields. For instance, VHF radio and GPS are widely used overall in aviation but are not classified as dedicated radio aids in the same sense as DRDF and ILS. Additionally, the SOLO aid and autopilot system, as well as simplex and duplex communication systems, serve different purposes and are not central to the navigational and landing aids critical at military airfields