Joshua Slocum, a 51 year old, sailed solo round the world in a 35 foot yacht, which he had rebuilt.
He had no satellite phone, no GPS navigation aids, no radio, no back-up team and no auto-steering system. His timekeeping was a clock, that was missing the minute hand and was about right to the nearest hour.
I should say that Joshua was the first recorded person to sail single handed round the world. He set-off in 1895 and peacefully sailed into the record books