Silent is (generally) between 0.8 - 1.2 knots, your target is to get the engines down to 40-55 rpm. Some mods disable the ability to inspect the dials at point blank (where you would pretty much have your face right in front of the dials) and can only see them from the CE's pov making it tougher to actually correctly set silent speed. Running stock or basic GWX am pretty sure you can zoom into all the dials to see up close; where you can keep adjusting your speed down until the engines get into the right range.
Even using the larger dials it can be difficult, I usually error to the side of caution and kill the engines after the 2nd to the last dc explodes and then adjust speed back up once it gets to or below 1 knot.
If you want to set your controls up so that when you hit silent running it goes to real silent running you can modify the submarine's cfg file. You'll need to do a little math and adjust the silent speed down to what 1 knot is for that particular type of boat.
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