mapcomplete/assets/layers/gps_track/gps_track.json

{
  "id": "gps_track",
  "description": "Meta layer showing the previou locations of the user. Add this to your theme and override the icon to change the appearance of the current location.",
  "minzoom": 0,
  "source": {
    "osmTags": "user:location=yes",
    "maxCacheAge": 0
  },
  "#title": {
    "render": "Your travelled path"
  },
  "tagRenderings": [
    {
      "id": "Privacy notice",
      "render": {
        "en": "This is the path you've travelled since this website is opened. Don't worry - this is only visible to you and no one else. Your location data is never sent off-device."
      }
    },
    "export_as_gpx"
  ],
  "#name": "Your track",
  "mapRendering": [
    {
      "width": 0,
      "color": "#bb000077"
    }
  ]
}