This mod replaces the sepia radar map with one that shows the terrain, like the one in vanilla M2TW and Kingdoms. It might need some tweaking for Mordor and the desert regions but it's nevertheless a bit clearer than the old map. I also included a plain parchment background texture.
To install, place the data folder in the Third_Age directory and overwrite the files. You may want to make backups, the files replaced are radar_map1.tga, radar_map2.tga and radar_map_background.tga.
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Version 2 is further down the thread.