Hi Ashley, sorry for the late response. The navigator now works in the dashboard portlet in UMP 8.47/8.5. When selecting a widget from the list the widget is highlighted as the line below:

The latest versions of the dashboard portlet include some new features and fixes. Unfortunately some of the fixes (as this navigator problem) are not documented.
Some of the documented enhancements and fixes:
Dashboard Navigation Enhancements
New functionality allows the user to set a default dashboard and to define dashboard navigation to linked dashboards. In addition, the user can remove unneeded breadcrumbs from the dashboard path and unneeded tooltips from dashboard widgets. For more information, see the topic Restrict Dashboard Navigation.
https://docops.ca.com/display/UIM84/What's+New#What'sNew-DashboardNavigationEnhancements
Dashboard Context Selector Text Now Appears in Generated PDF Files (Support Case: 00373330)
In some cases, the text label for a context select box would not appear in a PDF generated using the Generate pdf option. This issue has been corrected, and the text label now consistently appears in PDFs.
Release Notes - CA Unified Infrastructure Management - 8.4.7 - CA Technologies Documentation
Please take a look at the Ideas raised by other customers for the HTML5 Dashboard portlet:
https://communities.ca.com/search.jspa?q=dashboard&type=idea