Getting around using old INS Systems
Just studying my ATPLs and doing the stuff about the old INS systems, where you have to input the coordinates of the waypoints of your flightplan into the system. Concorde uses this system if I am correct, and 737-200, 727's etc.
My question is, what happens when it comes to receiving an unplanned "Direct to" during your STAR, or maybe a just out of coinsidnce the ATC says "Direct BLUFA"....halfway through your route,....what happens? Does the FO have to input the cordinates, then insert all the route after BLUFA again?
Also, does the FO programme all the SID/STAR waypoints in the INS or does he just plug in the radials from the given VORs etc.
Thanks in advance.