Notes about the TTM file extension:
Incorrect file associations could be the result of underlying issues within your PC system. As such it is highly recommended to scan your PC for invalid registry entries
, unused processes and other unfavourable system settings to identify slowdown issues.
The TTM file type is primarily associated with 'TeleType GPS' by TeleType GPS. 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.