sea room

from WordNet (r) 3.0 (2006)

sea room
    n 1: space for maneuver at sea

from The Collaborative International Dictionary of English v.0.48

Sea room \Sea" room`\ (Naut.)
   Room or space at sea for a vessel to maneuver, drive, or
   scud, without peril of running ashore or aground. --Totten.
   [1913 Webster]