Hi guys. I am trying to load more detiled charts of the islands in the subject. i have the base cmap but its not very detailed, especialy for cuba. does anyone know where i can get charts or (and its highly possible) if i already have them, how do i turn on the better detail?
many thanks.

Assuming you are using OpenCPN for charts, your best source of info on downloading and installing charts as well as using all the other "bells and whistles" included in the program will be found at:
The OpenCPN Website

As for charts, you have lots of choices including free, and not-free...
OpenCPN has a basic list of chart sources here

Free download of NOAA raster charts for gulf of mexico and parts of the Caribbean basin here and here

A set of charts for Cuba (converted from NGA's original format) are available here.

Thank you CapCouillon
All sorted now many thanks for the suggestions. Been hard at work getting ready to get out of the yard. Happy sailing to you.