1990(Optatus Sextant OL-SX-18)
- Type: Passenger
- Displacement: 25,441 tons
- Dimensions: 572 x 84 ft.
- Machinery: Pielstick diesels, twin screw = 19 knots
- Passengers: 1025
- Crew: 389
- Builder: Wärtsilä Shipyard, Abo, Finland, 1969
- Service: Owned by Costa Line (Italian flag). Originally built as container cargo ship Axel Johnson, one of five sisters built for the Johnson Line (Swedish flag). Sold to Regency Cruises (Greek flag) in 1986 with intention to be rebuilt as cruise ship Regent Sun. Project never materialized; ship sold to Italian interests, also with cruise-ship conversion ideas; renamed Sea Venture, then Italia. Sold to Costa Line in 1988 and rebuilt at Mariotti, Genoa, as Costa Marina; completed 1990. Refurbished in 2002 and still in service. Sister Annie Johnson became cruise ship Costa Allegra.