I was at the SSA Convention in Knoxville, TN in 1999 and was amazed at the poster-sized depictions of 3D flight traces with realistic scenery derived from GPS logs and satellite imagery that Carl had developed from soaring adventures in the Owens Valley area. You could literally see the entire flight- climbs, wind drift, altitude and everything. It was like SeeYou, but years prior to its introduction. As a hang glider pilot, my eyes were opened wide. Carl was most generous with his time explaining the technology we were about to enjoy. It was enlightening, and was a major influence on my inevitable decision to transition to sailplanes from hang gliders.

Of course, some orthopedic surgeons also had a say in the matter.

RIP, Carl. I will remember you.