I'm a bit confused. I was excited to click the link, but they look nothing like the admiralty charts that I grew up with sailing. In fact the water areas seem to have no detail at all. I enabled all layers.
This is what a chart used for navigation in sailing looks like today:
This is what a chart used for navigation in sailing looks like today:
http://upload.wikimedia.org/wikipedia/commons/0/0a/NOAA_char...
Notice specifically the depths throughout.