One thing no one of this opinion appears to have considered is that he knew the area well from having spent over 4 years working at the Glasgow unit based a couple of miles from the crash site. I am sure he spent may an hour hovering over the city centre, in which case he would have known not only the layout of the city intimately, but many of its prominent buildings well also.
Bladecrack, Sven,
I think you are being slightly unrealistic in expecting a single pilot to be able to remember the exact location of a small non-descript building, among many other larger buildings and obstructions, while dealing with (probably) a major emergency, at night! Yes of the course the pilot (RIP) was familiar with that part of the city, but what tends to stick in our minds from local area knowledge is the features which are either a hazard to us as we go about our business, or useful landmarks (in many cases, one feature can be both at once). The Clutha was neither of these.
In fact, your mention of 'prominent buildings' kind of makes my point for me!