Tractor guidance (TG) improve environmental gains relative to non-precision technologies; however, studies evaluating how tractor operator experience for non-guidance comparisons impact gains are nonexistent. This study explores spatial relationships of overlaps and gaps with operator experience level (0-1; 2-3; 6+ years) during fertilizer and herbicide applications based on terrain attributes.  Tractor paths recorded by global navigation satellite systems were used to create overlap polygons. Results illustrate operator experience level is critical for enhanced efficiency gains (for non-TG comparisons). Operators with 6+ years of experience reduced overlap 7.7% and 20.6% compared to drivers with 2-3 years of experience and new operators, respectively. New operators had consistently higher overlap across all slope (<0.5, 0.5-1, 1-2, 2-5, 5-9, and 9-15%) and roughness classes (<0.1, 0.1-0.2, 0.2-0.3, 0.3-0.5, 0.5-0.7, 0.7-1 and > 1). A low interpersonal reliability value of 0.02-0.03 indicates operator experience is crucial to estimate TG efficiency gains and consistent drivers experience levels are needed when evaluating economic and environmental gains from TG.