modding the pip boy map

[faradnc69]

hello im rather a novice at modding fallout 3, i have seen some mods that place a coordinate system onto the ingame pipboy world map and was wondering what file i have to alter or what steps i should take in geck to create my own personal coordinates system, also if it wouldn't be too difficult to place a x,y coordinates display in my hud so i might not have to stare at my arm so often. Thank you for any advice, or links if this is a recurring theme in these discussions.

 

Thank you in advance

 

Faradn