The file responsible for sound contacts (among other things) is ContLine.tga which IIRC should be in the data/menu/gui folder, if you replace it with the stock file you'll get colored hydrophone contacts back.
The little problem with this is, that it will also make those little tails on ship symbols also colored (i.e. red, green, blue). If you don't want that, you'll have to edit the file with Photoshop or a simmilar programm. What you need to do, is to erase parts of the line at both ends, you'll probably have to experiment somewhat to see how much you have to erase exactly.
Alternativly you can use the ContLine.tga from the IUB mod where this has been done already. This will also give you a dashed line instead of the solid one you have in GWX and stock SHIII.
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