1. An on-board vehicle control method comprising: storing information representing a plurality of boundary points of a boundary that circumscribes an area of interest; obtaining a vehicle location of a vehicle of interest; determining via an on-board vehicle controller a first boundary point of the boundary points that is closest to the vehicle location; generating via the on-hoard vehicle controller data representing a geometric relationship between the first boundary point, the vehicle location and a second boundary point of the boundary points, the geometric relationship including a first straight line connecting the first boundary point and the vehicle location, a second straight line connecting the second boundary point and the vehicle location and a third straight line connecting the first and second boundary points; calculating via the on-board vehicle controller reference point data representing a reference point based on the data representing the geometric relationship; determining via the on-board vehicle controller coordinate condition data based on an angle between a predetermined direction and a reference line connecting between the first boundary point and the reference point; and determining via the on-board vehicle controller whether the vehicle location lies within the area of interest based on a comparison between geographic coordinates of the vehicle location and the coordinate condition data.