On Jan 9, 7:42*pm, MarkHawke7 wrote:
*What then is the problem with the refinement
suggested by Andy to center the half circle on the line connecting the
start center to the first turnpoint center? *

One disadvantage of my proposal is that a start made just behind the
fixed semicircle diameter would be invalid and no points at all would
be scored for the day. I doubt any current flight computer software
would flag that start as invalid. I suppose its a trade off.

Andy