User Projection

This question is really for FastSurvey in the Promark3 which I think is closer to 1.6 than 2.0
When creating a Transvere Mercator projection there is a field for "width", what value would go ine here? kM, miles, degrees?
thanks
When creating a Transvere Mercator projection there is a field for "width", what value would go ine here? kM, miles, degrees?
thanks