The USNG grid requires the map coordinate system to be NAD 1983 UTM 17N for Florida... BUT once the map properties are changed, the map can't be shared online as a webmap because the map properties coordinate system doesn't match the base map which is always WGS. How do I get a base map in UTM Meters? Or Is there a way around this problem? this problem does not occur in Desktop because it doesn't require or allow a base map when sharing online.