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TeleType GPS .ttm files are based on U.S. County maps. The TeleType GPS program provides a simple way to load maps, simply click on the city or town for which you want to load street maps. For those who need a correlation between .ttm files and county names you can use the following link provided by the U.S. Environmental Protection Agency (EPA) to determine state and county codes. http://www.epa.gov/enviro/html/codes/state.html or another link provided by the U.S. Census Bureau (which also includes latitude and longitude coordinates http://www.census.gov/ftp/pub/tiger/tms/gazetteer/counties.txt The TeleType GPS .ttm map files are composed of five digits. The first two are the state code, the last 3 are the county code. Using the TeleType GPS CD-ROM locate the folder called 25_MA (inside the Maps folder), then select both of the corresponding tgr files, in this case it would be: tgr25017p2.ttm and tgr25017nr.ttm |