I tried cartographer, but it had a bunch of junk I didn't want or use, and I just didn't like the feel of it. I preferred gatherer for marking my nodes, but I need some coordinates... Since I was using the default map + gatherer, I really just needed something that did absolutely nothing except put coordinates on the bottom of my map screen, that's when I found it; pCoords. The author said he wrote it just for the exact reasons I wanted. Something simple, no setup, extremely little memory use, and did absolutely nothing except put player and cursor coordinates at the bottom of my screen.
So I use gatherer + pCoords