I wasnt aware of any regulation that required the captain of a pleasure boat to even know the difference between 11.9 miles and 12.1 miles, or to have equipment that measures and records that distance offshore, and whats "offshore"? High tide mark? Nearest sandbar? What tide? In some places "shore" goes in and out half a mile several times a day. Most current chart? Sand bars down here move with the longshore currents faster than a chart can be updated. I could drop the hook at 12 miles offshore, and in 24 hours without moving I would have to alert customs four times that I had crossed the
line?