I think you should take the a low approach. 75nm looks ok. Newspapers are often trying to refer to manufacturers data. I remember watching a documentation over 688i Subs in the early 2000's where an officer proudly stated they could detect enemy subs with their passive hull sonar at 2000+ miles. I fell from my couch and needed 3 minutes to stop laughing. I served for two years as a sonar operator in the german navy and and had never ever before heard so much sailor's yarn.
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