TT
Manapouri/Te Anau is closed more frequently than QN due weather, mainly fog. Most cases when QN is closed MO is no better. NV is the logical alternate. I am sure that 5 hours by bus is a bit of an exageration.
For MO to improve it will require at least a VOR. Airways would like to dispense with the NDB which would leave a GNSS approach as a possible alternative but with NZ's present rules sole means GNSS is not permitted within the NZFIR.
