Sh1 is still ahead in some things if compared with sh4
Radar is clear, easy to read and funtional,and there are a batitermograph, great ramdom campaign with almost the same single missions in sh4 and sub vs sub engagament.
customizable vibility distance, good damage screen, some heavy flooding can damage electric engines after some time.
Great maps graphics,
IA have a realistic behaviour, merchants start evasive maneuvers when your torpedoes are detected or explode and destroyers start to look for your boat, firing at your periscope if is spotted.
Captain cabin with calendar, log book, and recognision book.
