"and that doesn't mean when the instruction is given!"
HD - my native language is german, so forgive me if I ask you:
you actually mean us pilots have to apply black magic during final approach or
is second sight a new requirement for the medical ?
Being a clairvoyant is not in my jobdescription....
Now, seriously: if that is a published requirement/constraint, then one clearly
have to tell ATC ASAP. Since Easy is not an adhoc charter organization IŽd
think they and ATC now what to expect from each other...