About Red Book
It's still good guide but it was made for Sub Command where some aspects of game works little different than in DW. DW have better game engine physic. For example TA does NOT follow directly own submarine path, so crossing contact bearing from TA + another passive sonar won't give you CLEAR picture like in Sub Command.
Also RA haven't detection limitation by range but level of noise. In vanilla DW/SC all above some range - no matter how loud was, you had'nt chance to detect it.
Currently in RA you can detect cavitation of submarine from over 20-30 nmi.
All advices in RED book based on assumption: you can detect enemy first and have some time before enemy will detect you. (Seawolf vs Akula II)
In RA Akula II have also very sensitive TA and assumption above is wrong
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