You should be able to this JSTS I think. Create a line with the gps track, create a buffer with the specified distance, feed the resulting polygon to your mappi

You should be able to this JSTS I think. Create a line with the gps track, create a buffer with the specified distance, feed the resulting polygon to your mapping library. https://github.com/bjornharrtell/jsts/blob/master/README.md https://github.com/bjornharrtell/jsts/blob/master/README.md Sample use: http://bjornharrtell.github.io/jsts/ http://bjornharrtell.github.io/jsts/