Our distances are not driving distances, but are calculated as a 'straight-line' (or point-to-point) distance from Y. A straight line distance ignores things like rivers, canyons, lakes, et cetera - it's truly a line drawn from Point A (ie- Y) to Point B.
Our distance measurements begin at a specific point in Y. The point that we are using is located at these GPS coordinates - Latitude: 62.0368, Longitude: -149.9872 [Map]. In this case, the coordinates for Y have been taken from the 2010 Census.