The maps built so far are indeed self-critisised themselves by map builders; there is one "bumpy", built by radio altimeter, reflecting the ground curves below indeed very suspiciously timely, one - more decent glidescope (if they were getting oriented by barometric altimeter), one - combined (radio altimeter to 100 metres and barometric altimeter from 100 metres) - all along that mysterious "A", who said "400" in the vicinity of the Far Beacon - could have simply meant something like (oh) 400 metres (visibility). As they were just previously informed of that.