Our distances are not driving distances, but are calculated as a 'straight-line' distance. A straight line distance ignores obstructions like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Sumner) to Point B.Our distance measurements begin at a specific point in Sumner. The point we use is located at these GPS coordinates - Latitude: 48.7797, Longitude: -108.1043 In this case, the coordinates for Sumner have been provided by the Geographic Names Information System (GNIS).