Same here. I have an iPad mini 2 running iOS 10.3.3 and the overlays are not working; the land and the sea are just grey. The "w" in the red icon at the top of the page just rotates and the three red vertical bars next to "Wind " on the right side are saving up and down. However if I chose a favourite location, the location is indicated on the map and the meteogram at the bottom of the page shows correctly. I have deleted the App twice and reinstalled it twice, but there has been no change to the app's performance.
I have and iPad 3 (Retina) running iOS 9.3.5, and the App it's running fine.