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The Navy that lost it will generally only have a very vauge location such as in a certain assigned patrol area or to or from that patrol area.Sasquatch:If it is a sub then the long/lat will be on record. Find the military authority that may have lost a ship and search their records. See if the location matches what they show. To the best of my knowledge there are no "missing" subs.
Also, when one sees a sub profile how is one sure it's not a sub fully operational?
Sea ya!