The ground manoeuvring is a lot more than just pilots having to see, it is also the controllers who have to be sure where each aircraft is on the apron, taxiways and runways. The current technology uses both aircraft transponders, TCAS, ground control radar, Multi-lateration and ADS-B (if fitted). Knowing where you are on the airport is easy as the aircraft GPS will plot your position on an airport map either as part of the aircraft FMS or electronic flight bag - just like the GPS in your car or phone (but a lot more accurate because it will also have up to three receivers and more than likely be connected to an INS as well).

The last time that two whole flight crews and a controller got that wrong killed about 800 people in Tenerife.

At the moment the controllers do have ground control radar, very much like the rest of the world. Each part of the airport is blocked into zones and one aircraft is permitted to move in each zone at a time.

As Auckland only has a handful of fog days a year, the zones are large and can be managed by two controllers at once. However in other busier airports around the world, the zones are smaller and more controllers are available to manage the situation.

Everything developed by Auckland Airport must meet NZCAA and ICAO requirements, so it may be fine to develop better technology but to push it through the certification process and get it approved could take at least a decade.