ATC
HGS is not a guarantee for Cat III approaches
In the past several years there have been many magazine articles touting the promise of the Head-up Guidance System (HGS).

In the past several years there have been many magazine articles touting the promise of the Head-up Guidance System (HGS). It is a system that has great potential for Part 91 operators, but currently IBM is the only Part 91 operator certified and current to use an HGS for Category II/III approaches. Several large corporations have given up trying to put their systems into service.

Apparently there is a misconception that if an HGS is bolted in your aircraft, you can use it immediately to fly an approach to lower than Cat I minimums. To do that, you need an operations manual certified by the FAA, and to have a manual you need to develop your own Cat II/III program, including maintenance, operational and training procedures.

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