@synner88 I think heatmap is more realistic. It doesn’t use much memory space.
My idea is that when syncing a route, suunto app merges that route with heatmap around it, then send the merged route to a watch. On a watch-side, heatmap can be shown in light-gray color and doesn’t affect a route navigation. With this, we can navigate planned route in comparison with heatmap.
If this can be implemented, I believe that Suunto watches can beat any other watches with topo map.