maps

I believe you add the co-ordinates on your cluster.

on your Cluster > Options > Location here there is a way to add in the location. This is then brought into this widget in PDM.
 
is your Backup Server up to date?
Then in the release notes of the Datacenter Manager: https://pdm.proxmox.com/docs/roadmap.html#release-history
New widgets visualize the location of remotes on a map and use gauges to show the utilization ofresources.

  • Locations should be set via the node or datacenter options on Proxmox VE remotes.
  • For Proxmox Backup Server remotes, the location can be set under Configuration → Other →Location.