Originally Posted by Colin Stone
Just installed 2.1.0 and the AIS tab lacks the roll over options to display data on targets.
In itself, the answer is simple: This feature is not a part of the 2.1.0., it was introduced in the early 2.2 beta series.
2.1.0 comes with documentation
that shows this fact. A problem here is that every link in the documentation
goes to the Wiki, that reflects the beta development. It is a bug, see this tracker entry.
To read the documentation, don't use the links,just scroll down the page to find what you are looking for.
This bug has now been fixed. In the next stable release, links in the documentation will be (mainly) internal.
For now, it is admittedly a confusing aspect of the documentation.