1. All Sensors have been tuned for a more realistic performance
2. All ship gunners now improve the precision of their shooting in time
3. Small, irrelevant, units don't show up on the map or clutter the sensors
4. The radar and hydrophone won't detect units that don't have a signature of that kind (sampans, rowboats, etc)
5. New orders received by the player are presented through a radio message pop-up.