Fixed bug regarding azimuth calculation.
Revert "Fixed bug regarding azimuth calculation."

This reverts commit f1b0cd3f762b807bad98f74fe674a1fb4c12325a.
Revert "Revert "Fixed bug regarding azimuth calculation.""

This reverts commit 6d6f49bf8d63bb8a1f1a5f6b32ed8ee85c0dce76.
Fixed azimuth calculation.
Fixed small problem in XML parser.
Added HUD.