Cripes, get it right chaps. I might be coming the other way. Love Boeings but my Airbus mates were recipients of fabbo instructors, one in particular who said; "Just look at your Nav Display...ND............get it ? North, Descend............ The rest you can work out. Boeing boys just have our lower screen, can't work out a suitable mnemonic. Keep a good look-out fellas.