The term GA ASTRAY can be broken down into two parts: GA, which stands for General Aviation, and ASTRAY, which means to wander off course. General Aviation is a term used to describe all civil aviation operations other than scheduled air services and non-scheduled air transport operations for remuneration or hire. The crossword solution ERR refers to the fact that when a pilot strays from their intended course, they are said to have erred. Therefore, the term GA ASTRAY can be interpreted as a pilot who has gone off course while flying a general aviation aircraft.