Offshore Fixed Installations will be assigned appropriate Aeronautical VHF and Non-Directional Radio Beacon (NDB) Frequency Assignments by the CAA which may take between 4 and 6 weeks to obtain depending on the international co-ordination necessary.

Offshore Mobile Installations and Vessels are required to use different VHF and NDB frequencies depending on their location.

Details of the frequency assignments can be found in the NATS Aeronautical Information Service (AIS), The UK Integrated Aeronautical Information Package (IAIP), and include the following:

For Offshore Fixed and Mobile Installations

ENR 1.6 - ATS Surveillance Services and Procedures / ENR 1.6.7 - Off-Shore Operations 

For Offshore Mobile Installations

ENR 6 En-Route Charts ENR 6-1-15-8, ENR 6-1-15-9 and ENR 6-1-15-10  
 
Please note that Aeronautical NDBs may need to be able to tune over the frequency range of 435kHz to 949kHz depending on the area of operation.