Follow these instructions to plot multiple locations on one map:

https://www.create.net/support/218-how-to-pin-point-multiple-locations-on-google-maps.html

Willem, I tried to make a google map account with your parsons.edu account, but it said that there is already an account associated with it. You have to be logged in to be able to save multiple locations.

Per convo I had with the SS customer rep, there is currently no way to show multiple locations on one map using the map block native to SS.