The Track displayed in this Map has elevation data associated with it, clicking on it will display an interactive elevation graph.
Minimum/maximum elevation and total length statistics are also displayed.
Customise in Settings > Misc. > Elevation Options.
A couple of things to note:
- The tracks uploaded to Waymark must already contain elevation data embedded within it, as Waymark does not look up elevations.
- Impossibly high or low (i.e. "-99999m") minimum/maximum elevations will cause crazy graphs and are caused by bad data associated with your track, not a problem with Waymark.