1. I see the differences between cm93 and S63 in souther UK.
2. Regarding Wrecks: Some "Non-dangerous" wrecks are simply not present in the S64 test data. This is cartographer's choice.
3. Regarding Towers: Since cm93 was first published, the Feature type "Towers" was judged obsolete, and not to be used again. There should be Landmarks in these places, instead of Towers. But these Landmark features are missing from the S64 test data. There are similar omissions in the current
Australian ENCs, so the problem is up to the issuing hydro agencies to update the ENCs.
4. In general, I could not see the missing towers and wrecks on S63_PI, Version 0.5 and 0.9. This makes sense if the Towers are simply not present in the data set.
So, this is no problem with S63 PlugIn. The "trouble" is in the data sets.
Thanks for testing