Looks accurate enough, there's plenty of maps on The Vault to confirm/correct locations exact positions.
Curious, are you using the http://www.nma-fallout.com/forum/dload.php?action=file&file_id=1147?
I actually just stumbled upon the maps. I got the Fallout Trilogy package a few weeks ago, F1, F2, and Fallout Tactics. Haven't tried tactics yet, but I've been loving the first two Fallouts despite how old they are.
It seemed that with each game, they hopped to an entirely new region that was neighboring the previous one. The Van Buren game map would've apparently had NCR's most eastern outposts in the western zones of the map. So really, most of the game would have taken place beyond any organized civilization. A real frontier feeling to it.