Somewhere out there, on the frequency 12359 kilohertz, is a man named Herb who will give any boat a personalized weather forecast upon request. He's more accurate than any weather service, say the mariners who rely upon his expertise. But very few sailors even know he exists. Herb says he averages 20 to 30 life-or-death cases each year, all from his home outside Toronto, Canada. He has been providing this service since 1987 -- for free.