For open world could you not set a course, real life players go about their real daily routine, with automated crew picking up hydrophone/radar/radio contacts and then notify all real players via email/sms when contact made. The boat then shadows automatically from safe distance, players agree to come online at certain time to take over controls and then treat as normal scenario. Would be pretty exciting to know your boat is traveling in real time and not knowing what/when you would encounter the enemy. Also you can retreat and back into automated mode. Something like that anyway.
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