A method for altering a swath path of a vehicle includes the steps of: loading a base swath path and an original swath width into a memory of the vehicle; generating a plurality of swath paths from the base swath path and the original swath width, each of the generated swath paths defining at least two geographic locations; measuring a current geographic location of the vehicle; determining a difference between the current geographic location and a geographic location of a swath path nearest to the current geographic location; determining a number of swath paths that the generated swath path nearest to the current geographic location is subsequent to the base swath path; dividing the difference by the determined number of swath paths to produce a swath width remark distance; and adding the swath width remark distance to the original swath width to produce a modified swath width.