Mast Set-Up Distance : The distance from the center line of the well to a designated point on the mast structure defined by a manufacturer to assist in the setup of the rig. (Spec 4F)
The Mudblogger (Oilfield, Energy and Related Photographs), Oil Field Glossary, TX, USA 2014. http://mudblogger.com/oilfield-glossary/, (Oil - Amer) {777}