see "Mexico nixes border maps for migrants" (Washington Times, 1/27/06)
http://washingtontimes.com/national/20060126-115358-8412r.htm

After an outcry from the US Government, the Mexican government has pulled back from a plan to give Mexicans free maps of places they could cross our border, including such information as location of water tanks.

Interesting, the Mexicans say they canceled the plan not because of protests from the US but because American anti-immigrant groups would get the maps and then know where to go to prevent the illegals from crossing.