Fair-weather /(?)/

Fair·-weath·er

Fair-weather

a.
  1. Made or done in pleasant weather, or in circumstances involving but little exposure or sacrifice; as, a fair-weather voyage.
  2. Appearing only when times or circumstances are prosperous; as, a fair-weather friend.

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