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Okay, I understand. So, if a hero has Sailing skill, navigation, or beacons (after receiving ANY navigation bonus), and he escapes a sea battle, he can no longer move. The most you can do is have another hero retrieve his artifacts by buying him out at the tavern. He can only move again on the next day. However, if he doesn't have any navigation bonuses, he can escape from the sea and continue moving on land after being bought out, on the SAME DAY.