I'm with Elliot and Kafka, sorta. IMTU, around TL 12 ships can follow a programmed Jump-1 route. At TL 13 they can do Jump-2, and so on. But I also suspect that computers can get a little messed up by jumpspace, requiring some kind of warm reset (abort, retry, ignore?).
Of course, ships need to transition into and out of jump. What if a computer is messed up when the ship jumps, and a human is required to manually precipitate the ship out of jumpspace on arrival? (Picture a guy in an XBoat shorting out a pair of terminals on the jumpdrive with a monkey wrench... shudder).
Or maybe people don't "cycle the power" at TL 12...