Originally Posted by
Alpine Flyer
They are If only because you don’t need transmitter hardware to publish new approaches but ILS isn’t going to disappear anytime soon and needs to be trained. I fly around Europe and have a single Alpine airport where RNP is required for the approach.
GLS in a Boeing is almost identical to an ILS with almost no training differences , except that it is a whole lot better . No beam interference and one station covers up to 30nm radius . And Cat III will be certified soon . Cost might be an issue now but I’ll bet there will be cheap MMRs for GA aircraft sooner rather than later.
If you had the choice why would you spend money on an ILS ?