The Map dashboard gives you a visual representation of the devices in your network and their connections. This dashboard is only available when you select a View or Subview.
The visual representation is provided by the Map dashlet, which is the only dashlet in the Map dashboard. Although the Map dashboard is only applicable to Views and Subviews, you can include the Map dashlet in any of your custom dashboards.
Note, you must click Save Map to prevent changes being lost when you navigate away from the Map dashboard.