.gpx

GPS Exchange Format, an XML schema for transferring waypoints, routes, and tracks between GPS applications

Dedicated renderer

Format facts

MIME type: application/gpx+xml
Apple UTI: com.topografix.gpx
Stock Quick Look: shown as plain text
Planned approach (census): syntax-highlight
Icon hint: generic-icon
Prevalence: universal

Renderer note (from the census)

pure Go XML parse for waypoints and tracks

Gotchas: GPS standard