[QUOTE=vballe;1642713] but they can hear my engine on full ahead on some 1600m.
QUOTE]
You were only 1600m away? Night time or not, I think you are pushing the limits of remaining undetected at that range. Also, I believe the visual range circles on the navmap are a "suggested" or "estimated" range of visual detection by that ship. In my experience with SH4, you need to be at least 2000 to 2500m away for a night surface attack. Someone will correct me if I'm wrong.
EDIT: If you were at ahead full you were probably kicking up a pretty good bow wake too. If I understand how the AI works in this game then that definitely increases your odds of being detected.
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