The Character Map also includes unicode characters which aren't supported by VSD, so you would need to use numeric entities (&#xxxxx;) in those cases. The copyright symbol is part of the iso-8859-1 character encoding, so it works fine.
According to this page
http://theorem.ca/~mvcorks/code/charsets/latin1.html
the trademark symbol isn't part of the iso-8859-1 character set, so if the test doesn't work for Janys, that should be why, and you can try this meta tag instead
<meta http-equiv="Content-Type" content="text/html; charset=windows-1252">
Windows-1252 does include the trademark. You won't have to worry about this stuff if/when Coffeecup adds utf-8 support to its editors, or if you stick with numeric entities.