I recently bought an older AVON inflatable, an SL4-60 to be exact. After researching the AVON line of boats, it seems that the 4-60 actually refers to the length, ie 4.6 meters, however, when I put a tape measure on the boat it only measures slightly over 12.5 feet or about 3.9 meters. Am I mewasuring wrong in determining the rated boat length or am I missing something?