Ultra MileCharter uses a Road Pack to compute the driving routes and their distances, times, and estimated costs. The Road Pack can be downloaded using Ultra Downloader or computed from an OpenStreetMap PBF file using the Ultra Pre-Processor.
Set the Road Pack using the Road Data box in the mid-left of the main dialog box:
Press the "..." button to the right of the Road Network box to select a new road pack. Specify the road by selecting the road pack's UMG file. The road pack's description will be displayed in the lower information box ("USA; 23rd August 2017" in this example).
Loading the road pack data into memory can be time consuming for larger road networks (e.g. the US). The Advanced Settings can be used to tell Ultra MileCharter to pre-load the road pack.