[HELP] Combining Two Maps

[ub3rman123]

I'm trying to make a very large reference map for modding so I can mark down locations on it. I found this map (Caution: Huge image), but it doesn't have a grid on it to show cell coordinates. I found this map, but it doesn't show locations. Is there a way I can get the cell grid and border lines onto the one with locations marked?

[Eiries]

Eh, I guess, with over 9000 hours of postwork. Problem is, the location map is from the subscreen map, which the grid map is a literal topographical view of the game's map. In short, even if you cropped like a fiend, it still wouldn't be 100% accurate. You might be able to get close though. Have the grid map layer on top of the location map layer, raise the contrast by like, 40, then set the layer to Lighten Only. This will make only the numeric text appear, except maybe above in the mountains.