CFM invented the term and here is his definition :
"A Microboat (smaller boat) in this thread should be less than 23 ft in actual length (not counting swim platforms)- a V Hull and I/O (sterndrive) "
"A Microboat (smaller boat) in this thread should be less than 23 ft in actual length (not counting swim platforms)- a V Hull and I/O (sterndrive) "