Recent Geometrics magnetometers use route files in GPX, KML, and other formats to describe mapped or marked surveys. Various tools – the Survey Manager route designer, online designers, desktop software, etc., can generate different flavors of these files. This document describes the flavor of GPX file used by G-864 and provides a simple recipe for transforming files generated in one on-line tool, into the flavor used by G-864. These other tools are helpful when creating routes that are not in the rectangular format that is the output of Route Designer. Click on Working with GPX route files for G864 to access the code for the tool.