adrift(p), afloat(p), aimless, directionless, planless, rudderless, undirected (adj)
borne on the water; floating
afloat(p), awash(p), flooded, inundated, overflowing (adj)
covered with water
"the main deck was afloat (or awash)"; "the monsoon left the whole place awash"; "a flooded bathroom"; "inundated farmlands"; "an overflowing tub"
out at sea
making successful progress under one's own steam