[Public-List] Charts and depth sounding

[R Kirk]

So you're lower on the totem pole than Sable I, James Bay, North Slope, etc. Wonder why they outshine you? More valuable, or just that they haven't been done in a while. also wonder why they do that far offshore area? 


-----Original Message-----
From: Stephen Gwyn via Public-List <public-list at lists.alberg30.org>
To: public-list at lists.alberg30.org
Cc: Stephen Gwyn <stephen.gwyn at gmail.com>
Sent: Sat, Feb 19, 2022 2:05 pm
Subject: Re: [Public-List] Charts and depth sounding


The CHS does re-survey, but not everywhere annually.
They have priorities, which are set by a combination
of factors including, traffic density, grounding frequency,
environmental impact of groundings etc: Here's a map
of the priorities:

https://www.mdpi.com/ijgi/ijgi-07-00240/article_deploy/html/images/ijgi-07-00240-g006.png

I sail in a dark blue, low priority area. The charts are based on 
surveys from 1992
and earlier. I imagine that within that area, there may be spots like 
Vancouver Harbour
and Esquimalt which get more frequent attention.

SG


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