Thanks for the reply.
I already had the NOAA link working in both coordinate map viz and Maps. I also got a default Geoserver map working in the coordinate map viz but for some reason I can't get it to show up in Maps.
Coordinate map viz
Maps app
URL: http://localhost:8080/geoserver/topp/wms?service=WMS&version=1.1.0&request=GetMap&layers=topp%3Astates&bbox=-124.73142200000001%2C24.955967%2C-66.969849%2C49.371735&width=768&height=330&srs=EPSG%3A4326&format=image%2Fpng
I know in the URL it doesn't show EPSG:3857 but under Edit layer => Tile caching it shows
My understanding is that 900913 and 3857 are actually the same. For some reason I can't get 3857 to display in the Gridset but on some other test maps it does actually show 3857 in the url when the gridset show 900913 so I suppose they are the same and Geoserver just show the old value for some reason.
I also got my custom layer to show in the coordinate map but again it does not show in Maps. The NOAA link shows in both.