I use just a black sharpie, not like the normal autograph ones, it’s a little fatter. I am at work now but I can also post a pick of the pen tomorrow.
There isn’t much to it bro, all I do is trace the lines, going slow and trying to stay on the lines. The fatter sharpie works best for this. The map is great but once you get all those pieces in Europe, they all just run together. These dark borders solve the problem nicely.
Make sure your cat doesn’t jump on the table while tracing. They love to rub there faces on the cap. Haha.
Give it a try man. You’ll enjoy the game more.
I’ll post my other maps tomorrow.