Found a website with free on-line nautical charts:
http://map.openseamap.org/
For Addu Atoll, it only shows a minor beacon on Bushy Islet (the small island at the northen entrance to the atoll, missing in SH5). No lateral buoys.
Here is my rework of Trevally/Sober's map, featuring batimetric lines from the website mentioned above, but with buoys as per sober's chart. The style is roughly based on real Kriegsmarine charts as seen on
kartengruppe.it: