View RNC (Raster Navigational Charts) behind the weather in Windy!
At the moment, I only have support for NOAA's charts (so, USA only for now, sorry!). In the future, I should be able to pull Navionics tiles, if there's enough interest.
The lack of features is partly because when I tried to add an interface, it seemed to be rendering behind the map (invisible) no matter which z-index I placed it at. Not sure why. Also, I'm unclear on how to set the preview thumbnail.