The Rules of the Air Regulations don't mandate a joining procedure. What they do say is that a joining aircraft should conform to the existing pattern and that an aircraft on final has priority over one which is not.
WR - the CAA's "standard overhead join" doesn't require you to overfly the signals square, it assumes you have radio. If you don't then you would need to.
An aircraft making an overhead join (and an aircraft in the circuit for that matter) will not be following any particular track over the ground. The standard OHJ says you should be WITHIN the upwind threshold at circuit height on crosswind and maintain circuit height until you commence the turn on to base apart from that you should expect aircraft to appear from anywhere.
Incidentally, can anyone tell me how you follow the CAA's
way of doing it when the circuit is right handed?
"Maintain 1000 ft above circuit height and observe windsock and traffic. Keep aerodrome suitable distance on the left of the aircraft." "All turns must then be in the circuit direction"
Only way I can see is to do it inverted.
