I asked my lake and they go off of Title. If it says 22' 1" on the title I am out of luck. It is nice because the Chaparral 220 is officially 21' 6" but is 23' 9" with swim platform. The previous registration has it down as 22' (neither of the official measurements), but it will work for me. It all depends on how it was originally titled. I believe now days they are including swim platforms in total length because they are part of the boat and not "extended". So the 2004 220 with the extended platform not molded to the boat will be similar length to a 23.5' boat today with a molded platform. By that reasoning, with my extended platform, my 22' boat may only be a foot shorter than say the Chaparral 246 (beautiful boat by the way). I could be wrong, but I read it on the internet so it has to be the truth.