Source : Webster's Revised Unabridged Dictionary (1913)

Seagoing \Sea"go`ing\, a.
   Going upon the sea; especially, sailing upon the deep sea; --
   used in distinction from coasting or river, as applied to
   vessels.

Source : WordNet®

seagoing
     adj : used on the high seas; "seafaring vessels" [syn: {oceangoing},
            {seafaring}]