Exactly, the notch is for sighting the distant point and the line is used to help align the bezel with the point. The line in the mirror is used to sight between the bezel and the mirror. I am a compass nut and I have a genuine new Silva Ranger, a USA Silva Ranger, a MC1-GM, Suunto military global compass, mostly the same as the MC2G you have and I have a real old genuine Silva Ranger with the silver aluminum bezel. The line is actually finer on the Silvas but it is darker. The Suunto I have has a prominent line but it is silver. I have no problems sighting with any of them. You could get some fine line tape from a drafting supply store (or Ebay) and stick a larger line of any color you choose to see if you like that better, if you really think you need it.
I prefer my Suunto global to the Silvas, seems smoother and will work anywhere in the world. I got it originally for a trip to Borneo that never came off.