Interesting discussion! I'm still designing my circuit boards in inches and constantly dividing mm on datasheets by 25.4 . My board layout software supports dimensioning in mm. I haven't tried that, though. What does a metric Gerber file look like? Are the dimensions converted to inches, or is their a header saying the dimensions are in mm (or um?)? Harold -- FCC Rules Updated Daily at http://www.hallikainen.com -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist