Nothing wrong with GOOD electronics. Seems these elections weren’t worked out before the ship went to sea. Bad move. And a mechanical emergency system for faulty electronics should have been mandatory before settling sail. (Could be minimal. Like emergency throttle and some emergency steering)
There is an emergency system. Pick up the intraship phone or the mike for the 1-MC system, tell engineering to bring the ship to a stop and to assume emergency steering duties. The ship can be manually ‘driven’ from the engineering department with voice commands sent from an observer above decks. This system isn’t ideal but it works; in World War II numerous US warships fought and sailed on with their bridges shot away or blown off, several suffering enough damage that the voice commands were given by the wounded commanding officer standing on the deck shouting to the engineers through the holes in said deck. It still works today.