Brendan Burke of Vero Beach, Florida, is a billfisherman and confidant of Roffer. He began his career before most boats had loran and sonars were the old “white line” machines that gave little more than soundings. He says most captains aren’t prepared to dead reckon. “It takes about an hour to swing the compass,” he says, referring to the process of adjusting a compass’s magnets to minimize error caused by other magnetic fields on the boat. “Lots of times, a stereophile will put huge speakers with giant magnets within a few feet of the compass, and that just wreaks havoc on your magnetic reading,” he says.