Hi Mus-te I would keep the sentence as is. When the ships have left port they are at sea. Ships float on the sea.
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MUSCOVITE"A new and exciting era of positioning on land, on the sea, and in space began with the launch of the first GPS satellite on Feb 22, 1978"(1) Can I change ON THE SEA to AT SEA without breaking grammar and distorting the original meaning?"A new and exciting era of positioning on land, on the sea, and in space began with the launch of the first GPS sat