Help... where is Enemy Capital Ship @base (in standard SH3 not modded or patched)

[Tessa]

If you're looking to do any real harbor raiding stock isn't going to give you anything, you'll need to go with one of the mods which populate the harbors and put capital ships in their locations from their historical records (and when they're out at sea). Biggest ship you'll usually run into in stock are the convoy escorts.