Jim Kennedy,
It's not fair to use my "steel trap" mind as an example.
Use a lessor, average mind, for your example, someone like
TEPaul, who's been playing there for 30 years who still gets confused and disoriented, who has a history of driving in the driveway of the house next door to GCGC instead of the club's entrance.
Even today, as I play my second shot on # 13, the general locations of the bunkers are known, but my focus continues to be on the horizon, at the dead tree top.
It remains a very uncomfortable feeling if you're in the midst of a less then stellar ball striking round.
One could walk the 60 or 80 yards forward to see where they are, but slow play and that type of activity are frowned upon at GCGC.
Not knowing their precise location also causes one to exercise caution, to be conservative when pins are in certain locations, or when hitting second shots on par 5's.
Other hidden bunkers have their identity revealed by way of checkered directional flags. Absent the flags, while you may know the general direction, depending on ground, wind, barometric pressure and your ball striking that day, they remain a bit elusive.
GCGC is unique.