The head of the National Association of State Boating Law Administrators says an explosion in the number of kayakers along the nation's waterways has become a "huge drain" on rescue teams, USA Today reported Wednesday.

"Paddling represents our greatest risk in the recreational boating community," says John Fetterman, who is also a member of the Maine Marine Patrol.

Fetterman told USA Today he supports legislation to require kayakers to take courses that teach them the basics of water safety.

No government agency tracks the number of kayak-related rescues nationally each year but the U.S. Coast Guard does track boating fatalities. Twenty-seven people died kayaking in 2006, the most recent year for which numbers are available, USA Today says.

Experts says one of the reasons for the sport's popularity is that kayaks are relatively inexpensive and can be hauled and used with ease.