Slocum talks about an omen that confirmed his ambitions for the Spray... what was the omen in the book, Sailing Alone Around the World?

Slocum learned that the spray had been sitting in a spot not far from the final resting place of John Cook. Cook was the last surviving passenger from the Mayflower. Slocum believed that being located so near Cook's ashes had to be an omen of things to come.