Afraid the coordinates are right. I’m (fairly reliably) informed that most of your suggestions have been tried without success.
Looking at Grantg’s comments earlier. – At your latitude, one degree minute = .22 nautical miles. Now I know they’re not the same, but to land lubbers that’s 387 yards. Therefore one second = 6.45 yards and this quiz question is in 1/10ths of a second. The answer must be something less than a yard in length/breadth. If my math is wrong let me know, but I don’t think I am talking about a “base” or even a geographical feature.
Goodness only knows how they got their information, but there is something small at this location.
Further ideas most welcome