Visual interactive map to show people and their locations (and other details)

Hi all, 

I work for a major law firm in the US and work closely with many attorneys, from different offices. 

My team and I are trying to build an interactive map that will show the attorneys locations and which department they belong to. The purpose of this is well, 1. To optimize partners visits when traveling to other offices and 2. To keep a dynamic record of this information. And hoping this is something we can escalate to client level later. 

Has anyone worked on something similar before, if so, which apps within the 365 realm will be my best partners? I am betting on Power BI but curious to see if anyone has worked with something different. 

Thanks in advance.