I am not an expert, but for what I read the best advice is to avoid it completely and get used to stadimeter instead; (there are mods that expand the zoom capability making stadimeter reads a lot easier to do), you can also start a career when radar is available.
The problem with sonar is that you won't know how proficient is the escort crew you are facing; if it is a green crew, and sea conditions are poor, then they might not get you, but if they are proficient, chances are they will go after you.
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