Or at least something slightly lower tech like an electronic compass that will keep a back bearing and fly the reverse course if signal is lost. But it has to

Or at least something slightly lower tech like an electronic compass that will keep a back bearing and fly the reverse course if signal is lost. But it has to be a question of cost too. Drones are attritable by their nature and there may be no more reason to try to recover one than you would recover a discharged bullet.