Surely the IGS was only a precision approach if you intended to land on the chequerboard - from there it was just a circling approach with a circling minima.
Circling from a minima of 675' is actually a higher minima than most runway aligned non precision VOR/DME.
(There is a technical thread somewhere on prune that looks at how far offset you can go until precision approach is no longer practical. e.g. DPS)
Last edited by Uncommon Sense; 8th Nov 2004 at 01:32.