Analysis of Methods to Assess Risk of Collision – JJ Report

Bolton’s Line of Sight method of determining Risk of Collision is aligned with Julian Joy’s, Proportional Navigation’s & Missile guidance system’s “Constant Bearing Decreasing Range” method.

Analysis of Methods to Assess Risk of Collision – JJ Report
Link for Seeing, Signing & Sharing Petition – http://maritimenz.com/AnnulConvictionGainedByAbuseOfCourtProcess
Bolton used his Line of Sight method to assess if Risk of Collision existed. However Mr Young said “that method is wrong … the collision regulations clearly say you’ve got to watch the compass bearing of an approaching vessel to assess the risk of collision”
My opinion on these comments & the time spent on discussing them in court is that mariners in smaller boats do use the methods described by Mr Bolton (who referred to the failure of the Relative Bearing, used by M Pigneguy, if a steady course is not steered)
An important point here is that the method used by Mr Bolton has seen him successfully navigate around the world, take part in chartering at several America’s Cup races & in other extremely busy environments.
It is always difficult to estimate distances across water due to a lack of suitable benchmarking objects. For a relative perspective in the distances involved during the incident, the total width of Waitemata Harbour from Devonport to the container terminal is .5 nmile ( about 900 mtrs) The width of the Channel between Browns Island & Iliomana Rock beacon on Rangitoto is 1 nmile (about 1850 mtrs)
The vessels 1st saw each other at distances well over 2 nmiles (over 3,700 mtrs) however that distance is not of significance to this analysis, as within the range of available water, visibility range was not a factor of limitation & maneuvering to avoid collision would not be necessary or normal at that distance.
In the open sea, these distances between large ships would be considered dangerously close, so it is important to point out that the situation & local conditions mean there is no fixed distance specified in any rule. In these harbour waters, passing distances between vessels including ferries are frequently less than 100 mtrs & can easily be so without any danger.
My analysis shows that had Seaway maintained course, safe distances would have been experienced & no ‘incident’ would have occurred.
Link for Seeing, Signing & Sharing Petition – http://maritimenz.com/AnnulConvictionGainedByAbuseOfCourtProcess

Bolton’s Line of Sight method of determining Risk of Collision is aligned with Julian Joy’s, Proportional Navigation’s & Missile guidance system’s “Constant Bearing Decreasing Range” method.
Analysis of Methods to Assess Risk of Collision – JJ Report,2014-02-02_1729

Analysis of Methods to Assess Risk of Collision – JJ Report

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