When you save the game with "save replay" checked, the game creates a bigger save file containing information about everything that happened in that mission.
In the load screen, when you select a save file that contains the replay, a new button appears, Load replay.
After clicking it, the mission will be replayed in 3D (external camera) with an user interface to show the important events (like firing a torpedo or sinking a ship) and to allow you to make jumps in time.
The fun part of the replay system is that at any moment you can press the PLAY button and jump right into the action at that moment and continue from there. So you are able to try alternate tacticts to a battle situation.
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Kilroy was here
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