autopilot driver unit repair

Solo sailing in the north Atlantic with a broken autopilot. Remaining 650 miles to the shore and the autopilot stop working. Nobody can replace me and the idea of nonstop steering min. 6 more days is frustrating. After 24 hours steerage and 100 miles and I'm very exhausted, but I get the idea. I am starting to producing my own driver autopilot in the middle of the Atlantic.