Herb had one of the first catamaran rating formulas that combined performance data and his proprietary VPP model. The country used NAMSA ratings for handicap. It was frustrating to use because he continually was improving the model and fit... so you could almost get a new rating monthly...
He fell into the trap of well... THIS version is more accurate so you should use the latest and greatest NAMSA table. Clubs got sucked into this briar patch and eventually decided to just use the spring NAMSA version.

US Sailing decided to really push the use of the USPN ratings and with this national recognition... the beach cat world switched over to USPN within a year or two. I think Darline had just taken over the PN job and she championed cats, cat sailing and the PN yardstick.