Chief C - "Constant Bearing = Certain Crunch" - but as you say, the plot was misinterpreted - with tragic results.

Unfortunatley too great a trust in electronic navigational aids still goes on.

I once took a 20' sloop though the Narrows in the Swale/ with my crew member using my old rotating LED Echo Sounder and calling the depth.

Panic ! Until he got his head out of the hatch, and could see where we were. - one can to port, one cone to starbord, pistol shot either side. Panic over - We made the pub in Queenboro' befor shut tap.

Gareth