Has anyone ever heard of pilotage? You know, when you look out the window, look at the colour of the water, the depth, location of the land and understand your geographical position with it?
You don't need a chart for any of that. Not in an emergency.
Name a passage in the Huaraki Gulf or Norhtland Coast you couldn't complete without a chart? We don't have tidal rips, there are no currents setting east or west like the English Channel. We don't have tides like Brittany.
The one tidal gate in NZ is at D'Urville Island, long way from the Gulf.
Any passage the in the gulf can