The reason visibility to the s sw was 2 km was that was about as far as you could see with the hills there on a clear day with any clouds hanging around the distant hills. We had no glide angle info for landing. We had reference altitudes crossing some tanks then just maintained about a 1200 fpm descent to flair turning final below 100 ft. Yes we got yelled at sink rate, sink rate a lot from the gpws. Unless you had about a 15 knot headwind to reduce below 1200 fpm descent it usually was going off below 100 ft. We would get fired for doing an approach like that anywhere else but to land in that 700 ft touchdown zone that was required.