Perhaps some modders can make 2 hydrophone sensors, one that works between surfaced and PD and one that works better PD and below? I'm not sure how you'd switch between them but you could theoretically get depth-related performance by just having several sensors with non-overlapping perameters of use.
Also a "Sweep/No Sweep" and "On/Off" switch for the Hydrophones like the Radar would be a godsend.
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