What is "fair-weather sailor"

Fair-weather \Fair"-weath`er\, a.

1. Made or done in pleasant weather, or in circumstances involving but little exposure or sacrifice; as, a fair-weather voyage.
   --Pope.

2. Appearing only when times or circumstances are prosperous; as, a fair-weather friend.

   Fair-weather sailor, a make-believe or inexperienced sailor; -- the nautical equivalent of carpet knight.