Our distances are not driving distances, but are calculated as a 'straight-line' (or point-to-point) distance beginning in Upper Kalskag. A straight line distance ignores obstructions like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Upper Kalskag) to Point B.
Our distance measurements begin at a specific point in Upper Kalskag. The point that we are using is located at these GPS coordinates - Latitude: 61.5419, Longitude: -160.3339 [Map]. In this case, the coordinates for Upper Kalskag have been provided by the Geographic Names Information System (GNIS).