[Public-List] Charts and depth sounding

[Stephen Gwyn]

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