In 1976 my six year old brother was killed in a schoolbus accident.
The bus driver was high at the time. He took a minibus full of kids down a back country road in Illinois at over 75mph. He flipped it three times...
He was laughing at the scene. My father was there at the time-he was a State Trooper. They had to physically restrain and disarm him-quite understandably.
I am not a big anti-pot guy. I don't smoke it but I personally don't feel that it is any more dangerous than alcohol. Still, anyone who thinks that pot doesn't affect your judgement is foolish. In your home, a joint, like a few beers, is no big deal. I think there is some medicinal aspects of the drug that is helpful.
Like many drugs though, you need to practice some sense with it. I can see sailing, like driving, isn't a smart move with pot on board. It's heavy machinery.