"German PPI Screen and Metric Nomographs"
Ah, ok. Thank you.
But now, that i think about it, the Metric Nomographs are not that important.
I have to multiply the nm with 1.852 to get Kilometers.
And I also have multiplied the yards with 0.91 to get meters.
I used to play imperial back then, but having the yards evolving into nm, and having yards on the radar, but the deckwatch then tells you how many feet the target is away...Brainphuck.
I also used to work in Florida at my aunts landserveying business, and renovating houses. I got a feel for inches and feet with the time, but going to a homedepot and having stuff like screws with 7/49 of an inch... Holy Moly.
Periscope spinnt:
Back then when playing TMO, i didnt knew about the specific dates of when boats are officially available. So i took every new command i could get so besides not working survace radar, i also now remember the exact same situation. Task Force huge Carriar and stuff, yes sir, periscope depth, and the periscope would just spin around at like 3 spins per second.
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