Dual (or triple) Honeywell HT9100 GPS units will provide RNP1, full GPS steering, and can, with a software upgrade, be compatable for RNP0.3...at considerably less cost.
No fancy glass, of course, I suspect however that this would not work for the RAF, as the Brits have an adversion to stand alone GPS units.
It's called the ...'not invented here' syndrome.
Their loss, civil operators gain
