I got another take, bare with me, bit of History
. I’m Ozzie so any flag waving for our British friends is unintended.
For more than 100 Years and thanks to Admiral F. Beaufort
who’s fine example on what a Hydrographic chart should look like became by chance Hydrographer to the British Navy
at the conclusion of the Napoleonic war, at a time when a large portion of GDP was spent on defence. Francis B. spent most of that allocation sending Survey
& naturalist expedition everywhere (Just in case another shady mob
took pot shots at the British) and truly they had a impressive maritime fleet.
The point is that a sailing vessel could find itself on a beach somewhere and a great deal of resources was spent on surveying the hinterland, creating pilot charts, ploted worlds magnetic variation, predicted tidal flows and horror of horrors chart corrections. His wind
force got currency as well.
Anyway the point is they were extremely interested in the coast, but as ships got more reliable, the Hydrographic department everywhere (except some port authority) has shown less and less interest on what matters to us. The older charts had a great deal more info, and soundings close in, views of distant hills, contour lines & a heap of stuff that is still relevant to small craft (us).
Those charts have gone, replaced by something more pretty for the serious deep draft
vessel. And often those CM93 & the like are a bit vague to save valuable memory.
I mourn the loss of opportunity, they are not ECDIS quality they will not see the light of day, because our Commercial friend are not interested anymore. So unless they are already scanned, fat chance of getting a copy now.