Retriever, I kinda thought that as well but could get same effect by looking over one's shoulder tho when I back into slip I face aft. It's just easier for me doing that.
Also thought it c/b used as a fish finder when anchored & viewing fish in chum slick behind boat???
Boat was heavily fished by condition of transom. "MANY" nicks in painted transom.....gaff or sinkers banging transom