It is not something that can be picked up and studied in one's spare time.

h/t Lords of the Sea: The Epic Story of the Athenian Navy and the Birth of Democracy by John R. Hale. Page 77.

Seamanship, just like anything else, is an art. It is not something that can be picked up and studied in one's spare time. Indeed, it allows no spare time for anything else.

The need for focus and practice in order to achieve excellence, recognized 2,500 years ago.