sniper, my friend, thank you for the graphics and explanations.
i encountered a differently config-ed DD while playing OpMonsun.
the A&B class DD seems to have three systems working. i am reading the .SNS file and guessing here.
Hydrophone128
Sonar128A (?) (N0x nodes?)
Radar286
so...would the longest range (circle) indicate visual or radar?
assuming the shortest two non-circles would be hydrophone and sonar, what is mystery-guest number #4?
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Silent Hunter 4 1.5 Gold Edition on CDROM
LAA enabled
Dell XPS with 32 GB Ram running Win10