Instead I gaze with purpose into the pit hoping to look like square jawed Jack Hawkins , Royal Navy cap at jaunty angle, bringing in Compass Rose. After all these mariners are sensible and logical people. They will take the best and most straightforward of routes. Rikki Bjerke is sensible and logical. The chart admits of no such impediments.
Computers can fall over.
I take a quick look. One hundred and ten metres. He switches off our engine. The next blast is nearer, and paralyzing. I can't see him.