GPX, or the GPS Exchange Format, is the file type used for the vast majority of GPS data sharing. When you download logs from your GPS unit, they will be downloaded as GPX or similar files. GPX utilises the XML format for storing information and looks very much like simple HTML. For people familiar with building and editing simple Web pages, the data contained in a GPX file is very easy to understand, as tags are used in a way very similar to HTML. Since XML is a widely-used format, GPX files can be edited in a variety of programs with relative ease.
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Open the GPX file in your favourite XML editor. The simplest free editor is Notepad on a Windows computer and TextEdit on Mac OS X. Some people prefer to use more complex editors because they colour-code the XML tags and provide easier readability for longer or more complicated logs.
Modify the information you are interested in changing. For example, if you have a day's worth of GPS tracks and want to single out an hour's worth of points, you can search the GPX file for the time tags. Then, remove the waypoint or points by deleting everything between and including the <wpt> and </wpt> tags.
Since GPX is an extensile format, there isn't necessarily a limit on how many types of tags can be used. GPX files generally contain information about track position points, time, speed and altitude. Other information can include waypoint location and labels. For a sample of GPX files, see Resources.
Save your GPX file. Make sure to use the "Save As" option so that you do not overwrite your original file.
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