Anyone knows? Please help me

I have some great track (gpx file) on the vatnajokull glagiar (the biggest in Iceland) and I think it great to show in osm BUT how? Should I mark it as a “tertiary road” (someone go here even with car) or leave it just like a gpx track… but then the user how can see it?

I’m not at all familiar with the local situation but I would not make a tertiary road on a glacier. I would not go further than taggin this as a track.
And the problem is: does the glacier move and at what speed? So does the road change significantly?