KB43912: Google and ESRI Maps support multiple dataset for plotting data on the map layer starting from MicroStrategy Web 9.3.1.

SUMMARY
Starting from Strategy Web 9.3.1, users now have the ability to add multiple sets of data to a single map widget. After adding the multiple datasets to the dashboard and creating grids, these grids can be added to the map widget. The display map also allows users to toggle which sets of data are displayed at any given time on the map layer. This way the user can be analyzing data from dataset 1, dataset 2, or from both of them at the same time.
 
HOW TO CONFIGURE MULTIPLE DATASET MAP WIDGET:

• Create at least 2 grid objects in a document
• Once the map widget is selected on one grid, go to the widget/map/ properties and select the "+" sign:
  
  

• Then the properties window will show both grid selections and allows the user to make the required configuration for each one of them:
  
  

• When the map is viewed in Strategy Web, notice there is a button that allows the end-user to toggle between different datasets previously selected: