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This image shows NIWA climate stations (red dots from a public NIWA WFS service) overlaid on the GEBCO WMS layer added to QGIS as described above.
Troubleshooting for inexperienced players:
If you get an error message when trying to connect to this WMS service that the connection has timed out, and this is the first time that you have used a WMS service on QGIS, you will need to set up your network settings with the NIWA proxy details as below: