The Detectabilty Levels are unique to each sensor and are a parameter of individual objects in game, universially they are refered to as SL's.
To each platforms individual SL's, go to the object dialogue (click on the Submarine in the main DWedit toolbar) and look at the column on the right in the object dialogue.
In terms of what environmental effects influence each sensor, you can check the sensor dialogue on the right hand side at the various flags (next to the detectibilty curve settings).
Cheers,
David
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LW
 
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