How to play with "No map contacts update"?

[poor sailor]

Well, I'm now using a GWX mod but with this option unchecked because of using "Assisted Plotting" mod. Is there any manual or something like that, maybe a some tips how is possible to play this game with this level of reality and this option(No map contacts update). When you check this option no sonar lines are visible. It's really hard and I from this moment start to looking how is possible to make a good measures on navmap and how to sink a ships. The "Assisted plotting mod" is already not easy to use because the sonar lines are dashed and you don't know the exactly and precisely end of sonar line. This mod is a part of NYGM which I use before, and when you have unchecked option "No map contacts update" You have a 100% in realism settings, and maybe because of that I have a practice to say that I play in 100% realism and now in GWX. Is there any idea? Any advice? Come on hardcore players, help me!