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Post by Deleted on Apr 4, 2020 11:13:52 GMT
Yes, . . really !! A large commercial vessel having to follow a precise line in a narrow deep water channel and gaining on pleasure craft dawdling along directly in their path can never be sure that they've been seen and that the smaller vessels will get out of the way in good time. Result, . . the large commercial, more often than not, is forced to reduce speed to be certain of avoiding running the pleasure craft down, . . or in other words is 'impeded' by the smaller vessel. Which course should it follow? STOP ?
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Post by TonyDunkley on Apr 4, 2020 11:24:46 GMT
Presuming that you're asking the question with regard to the two bridges illustrated, . . . inbound or outbound ? Outbound The smaller vessel uses span/arch No.4 at both Southwark and Cannon Street Bridges, . . notwithstanding that you've mucked about with the profile and lights diagram of Cannon Street Railway Bridge so it's arse about face !
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Post by Deleted on Apr 4, 2020 11:25:28 GMT
Of course the Mr Stabby route might be worth considering
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Post by Deleted on Apr 4, 2020 11:41:09 GMT
The smaller vessel uses span/arch No.4 at both Southwark and Cannon Street Bridges, . . notwithstanding that you've mucked about with the profile and lights diagram of Cannon Street Railway Bridge so it's arse about face ! Why do you think I have 'mucked about' with the picture?
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Post by TonyDunkley on Apr 4, 2020 11:46:52 GMT
Of course the Mr Stabby route might be worth considering Was that the rehearsal script for what he did at Blackfriars Bridge ?
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Post by TonyDunkley on Apr 4, 2020 11:53:58 GMT
The smaller vessel uses span/arch No.4 at both Southwark and Cannon Street Bridges, . . notwithstanding that you've mucked about with the profile and lights diagram of Cannon Street Railway Bridge so it's arse about face ! Why do you think I have 'mucked about' with the picture? Compare what you've posted with the bridge lights and profile for Cannon Street in the old British Waterways/PLA Guide for the Thames tideway.
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Post by Deleted on Apr 4, 2020 11:54:06 GMT
@nemesis took that picture straight from the tidal thames handbook.
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Post by Deleted on Apr 4, 2020 11:57:01 GMT
A bit odd though as the one I found is this
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Post by Deleted on Apr 4, 2020 11:57:28 GMT
Anyway, suspicions of evil subterfuge aside, please also explain why spans 2 & 3 are indicated as the preferred channel.
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Post by Deleted on Apr 4, 2020 11:59:27 GMT
I think they are indicating the navigation channel for inward bound vessels whereas the little black arrow is indicating the correct span for a pleasure cruiser.
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Post by Deleted on Apr 4, 2020 12:00:01 GMT
A bit odd though as the one I found is this There are two documents - one for upstream traffic and vice-versa.
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Post by Deleted on Apr 4, 2020 12:02:07 GMT
Upstream and downstream ?
That's a bit confusing. Does it refer to the tide direction or the direction of boat travel?
Normally the boat direction is described as inward or outward bound.
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Post by Deleted on Apr 4, 2020 12:03:15 GMT
I think they are indicating the navigation channel for inward bound vessels whereas the little black arrow is indicating the correct span for a pleasure cruiser. Certainly plausible but I can't find anything in that publication about it.
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Post by Deleted on Apr 4, 2020 12:05:05 GMT
Theory doesn't work with the one I posted though as that would put small pleasure boat in the way of the commercials.
I think it's a bit unclear specially for people not used to navigating on tidal rivers.
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Post by Deleted on Apr 4, 2020 12:06:11 GMT
Well that's how it is presented. Would you like them sent to you?
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