Airways within Shanwick OAC (T9 etc.)
Among others, there are are three airways within Shanwick OAC; T9, T14, and T16.
Is a full blown NAT MNPS approval required to use these airways?
If not, what is the procedure, specific R/T to be used and is still some sort of Authority approval required to use them?
Do these airways fall withing the theoretical VHF coverage or is HF mandatory?
Thanks for any feedback.