Our distances are not driving distances, but are calculated as a 'straight-line' distance that starts in Shady Grove. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Shady Grove) to Point B.
Our distance measurements begin at a specific point in Shady Grove. The point that we are using is located at these GPS coordinates - Latitude: 34.7334, Longitude: -87.4417 [Map]. In this case, the coordinates for Shady Grove have been provided by the Geographic Names Information System (GNIS).