On March 18-19, 2023, I enjoyed the HPDE event on the Charleston Peak full course at Spring Mountain Motorsports in Pahrump, NV. This event was put on by the Las Vegas Region Porsche Club. This track has significant elevation changes throughout which result in compression (more grip) and expansion (less grip). I added a vertical G-force indicator to display the Z-axis forces which for this lap ranged from +0.2g more grip to -0.3g less grip.