Tom (K8ERV) pointed out that having radials every 7.5° was not very intuitive, so now the map program generates maps with radials every 5°. This spacing makes more sense because the outer ring has major hash marks every 10° and minor marks every degree.
Due to feedback from John Faughn and Tom (K8ERV), I modified the server to set the Content-Disposition header to specify a filename. This resolved various problems