This is used to display a map.

Offset Type     Name             Description
------ -------- ---------------- ------------------------------
 0000  BYTE     cmd
 0001  UINT     key used
 0001  USHORT   gump art id      (0x139D)
 0001  USHORT   x1               upper left x location
 0001  USHORT   y1               upper left y location
 0001  USHORT   x2               lower right x location
 0001  USHORT   y2               lower right y location
 0001  USHORT   width            gump width in pixels
 0001  USHORT   height           gump height in pixels