A reasonable autopilot will do that for you too, on an ILS. It will take you to the runway, and you will definitely have enough surface visibility at that point no matter how thick the fog is
10540
Many wont! S Tech fitted to later Seneca Fives are rubbish King units fitted to earlier aircraft much better.
The S tech is fine further out on the localiser and glide but starts hunting the narrower the beam becomes.
In dense fog even coupled to the ILS how are you going to find a flair point without something like a radar alt?
The Radar Alt is a good bit of kit at low cost.
Pace