Chaps, i think the real question here is " Why do the rest of the aviation world use QNH?" Surely the most important factor in an approach is your height above the TDZ? Obviously in places that would require a huge wind (Nairobi, Calgary etc...) it makes sense to use an alternative, but in this country?
And in answer to the 'Q' question, 'Q' is the scientific denominator for pressure. As stated before, the 'FE' and the 'NH' should really be subscripts and stand for Field Elev. and Nautical Ht. Wish i could help with the others but i've never really heard of any of them,
Smiles,
Unc.
[This message has been edited by Uncle Ginsters (edited 30 June 2001).]