All it does is to give you accurate target's course estimation at distances beyond active sonar and periscope/stadimeter range. Stock radar cannot do this. This is very useful because you can get initial fire position sailing surfaced and not being spotted by enemy ships. Later you can submerge to carry out your attack. Possibly Japs did not have RWRs at that time which made American radars so deadly asset.
PS. Does this mod work with RFB 2.0?
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