In the UK the requirement is listed in CAA Standards Doc 7
Specific Radio Equipment Requirements for the IR Skill Test
a) For all skill tests for the initial issue of the IR, the minimum radio equipment must include the following:
2 x VHF Comms. Radios
1 x VOR / ILS Receiver with Glide-slope
1 × 75 Mhz Marker Beacon Receiver
1 x DME
1 x ADF
1 x Transponder with elementary Mode S
1 x RNAV equipment certified to RNAV 5 (BRNAV) – see (e) below
