For SHI, a manual that actually describes the game, the war, the real submarines and tactics, in part written by an actual sub commander.
A calendar with sunrise, sunset, moon rise, moon set, and moon phase information.
Bathythermograph. Air search radar that only displayed range and not bearing. Ability to turn on/off red lights. Abandon ship option. Surface radar that detects land masses. Compressed air. The ability to bottom the sub. In AotD, the ability to get the sub stuck in the mud. Chlorine gas from flooding reaching the batteries. The bar in AotD.
Just a few missing things.
Edit: Ack! How could I forget, from AotD, "Smoke on the horizon!"
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