I keep setting my working units to inch because my brain does not work in centimeters. However, everytime I restart Maya the working units are set back to centimeters?

How do I make inches the default working unit?

I have set my grid up to 12 units, 1 unit per main grid (1 inch) and 4 subgrids (1/4 inch). This works well for me in most cases.

The grid setup is remembered as are all my other changes to the preferences. It is just settings that constantly gets changed back to centimeters.