They need 450m at least for hial, this will help vis minima. Max benefit is obtained by putting in standard 900m. As I said, gold coast doesn't have the room. There are no plans for it's installation.
We looked at an rnav star to late ils option. It isn't ideal for 2 main reasons. a) I need to provide at least 2nm on loc before gp intercept. This pushes intercept out to 7nm. For a 5nm join, you wouldn't intercept gp until 3nm. Initial airline feedback was that it would be too close. b) There needs to be a nav mode change from rnav to loc at only 5nm out. Again this was argued to be too close. I think it would work, but it would involve an amount of training and trial.....with gbas though....it's a lot more possible
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