sine (SIN) function springs to mind via a generated table and a variable for the size of the individual circle

Cartesian-to-polar conversion might be handy too for a sweeping vector converting from X,Y information (easting/northing) to line-length and angle but this is to digress

Am I close?

Via Excel’s functions I mean and cut and pasting the XY points into the mission dot mis file?

Have a look at Extreme One’s ‘Normandy chimley pots’ posts at Ubi/SimHQ Painter. Interesting stuff. As is this work of yours. Very nice mate

The intervals are in 5 degree steps, excel expects angles in radians so use (RADIANS) to convert.

You don’t have to cut and past between files Ming (within a file yes) - if you read my notes, you’ll know I use Excel to edit the mission file directly