We’re having a “spirited” discussion over on Cruisers Forum about collision avoidance – one of the most controversial topics. It’s here: http://www.cruisersforum.com/forums/f90/collision-avoidance-cones-of-uncertainty-and-appropriate-cpa-189919.html
If any of you guys wants to see how WAFIs think about some of these things, or even better, if you want to weigh in, have a look (you can register in 2 minutes, and there are a lot of commercial mariners on the forum).
A big part of the discussion is about whether you can safely cross a line of ships moving at 20 knots, in a yacht making 5 knots, if the ships are 1.25nm apart. Obviously suicide – some people even did maneuvering board plots on it – but some on there insist that it’s ok as long as you set up to cross behind one ship with a 180 foot (!) CPA. Others are attempting to explain that a 180 foot CPA is the same as a 0 CPA. Your comments would be very welcome, either here or in the CF thread. The root issue is what is a safe CPA, and why – your opinions would be very welcome and helpful.