Wish to report, Dantenoc, that it works. My findings are that the faintest trace of "compass with concentric range rings", aka spider-web, can only be seen when zoomed-in to the max...which I never use at any rate.
I use, Sale U-999's, mods for large slideout dials and TDC and so I have a good mental picture of the azimuth of my boat in relation to the target(s) relative position and/or to true north. Admittedly, it was becoming a crutch when one could actually see his boat's position on the F5 screen. It serves the notion of realism in that ships' positions do not move on real charts. Using this method, the player gets an almost blank chart accept for the "spawning" of radio contacts (depending on percentage of realism chosen at beginning of play.)
It's still possible to employ your brilliant method of target interception, although with a little more room for error, which is fitting and proper and definitely more challenging.
Well done, everyone.