The default unit of measurement – mm or inches – depends on the regional settings in the Windows Control Panel. The first time you run Hatch Embroidery, the measurement system will default to whatever the operating system is using. The measurement units can be changed via the droplist on the Context toolbar. Technically, when you select ‘U.S.’, you will get the imperial measurement system – inches, feet, and yards. The selected measurement system will default the next time you run the software.