Hi Bristol,
You are probably referring to the 2006 movie 'Deep Water' which tells the tale of Donald Crowhurst. To quote the web review at IMDB.com: "Deep Water starts in 1967. Francis Chichester has just circumnavigated the globe on his own, but with a brief stop in Sydney. The Sunday Times announces a competition for sailing single-handedly around the world non-stop. Crowhurst enters....etc" The tragic story is well written in two books: 'A Voyage for Madmen' and 'The Strange Last Voyage of Donald Crowhurst'. I haven't seen the movie but I can recommend 'A Voyage for Madmen'.

Gravy7