For those actually interested in, you know, aviation...
Invercargill has VOR, VOR/DME, NDB and NDB/DME approaches to both runways (04/22). There is no ILS.
The lowest minima is on the 22 NDB/DME, and is 430 (425)-1500.
Guess he would be busting minima at 400 feet, but that reported altitude is almost certainly wrong anyway.
The bit I don't get is the skipper having only been flying for five years. Now that's career progression for you!