of Chesterfield that are in CM93 are spot on, including the location of big bommies. In normal SE winds, one can anchor
anywhere along the shore of the sand keys shown on the charts
(Les Trois Islots). One is not supposed to visit Chesterfield without permission, but many do so. One Canadian cruiser friend was arrested there and directed to return to Noumea for a court appearance. They chose to continue on to Oz instead. There were no repercussions, other than not being able to ever return to NC. We have heard that unofficially the French no longer care about yachts visiting, but are quite concerned about foreign fishing
vessels going there. Don't know how to evaluate this rumour, but suspect that it is true.
As to your proposed anchoring
in the northern parts
of New Cal
without checking in... do be aware that the French do both water
based and aerial patrols quite regularly, and they get very cross when they find folks doing what you are contemplating.
There are plenty of anchorages, some quite good, in the Belep group. There are also plenty of inquisitive Kanaks, some gendarmes and the above mentioned flights, all of whom will very likely lead to your being discovered. Your decision... The same applies to the northern end of Grande Terre.
through Grande Passage
without stopping is acceptable, and many do so regularly (including us).
Please remember that each time someone disobeys these rules and is apprehended, it makes life worse for all cruisers who follow in their wakes. Over the twenty plus years that we have been visiting NC, the French have been gradually making life easier for cruisers, reducing restrictions and simplifying procedures. Flaunting their regulations
is quite counterproductive IMO, and we hope that you don't decide to do so.