Our distances are not driving distances, but are calculated as a 'straight-line' (or point-to-point) distance. A straight line distance ignores obstructions like rivers, canyons, lakes, et cetera - it's truly a line from Point A (ie- Isabel) to Point B.Our distance measurements begin at a specific point in Isabel. The point we use is located at these GPS coordinates - Latitude: 45.3958, Longitude: -101.4290 In this case, the coordinates for Isabel have been provided by the Geographic Names Information System (GNIS).