Our distances are not driving distances, but are calculated as a 'straight-line' (or point-to-point) distance from Sylverino. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line from Point A (ie- Sylverino) to Point B.
Our distance measurements begin at a specific point in Sylverino. The point that we are using is located at these GPS coordinates - Latitude: 33.3168, Longitude: -93.9377 [Map]. In this case, the coordinates for Sylverino have been provided by the Geographic Names Information System (GNIS).