I've created a simple graphic to print out and use when laying out the 180 degree Line of Fire/Line of Sight arcs Infinity needs on figure bases.
PDFs in both Letter and A4 here: http://www.warbard.ca/2015/10/06/an-eas ... ng-widget/
Here's a graphic, although I recommend grabbing the PDFs off my blog as they'll print better.

The rings start at 20mm and go up to 60mm, so should allow easy centring of any of the usual base sizes in Infinity or anything else you play! I threw 60 degree (hex) arcs on there as well, because why not?
