From the detail cared of the selected record, Proximity Search lets you to view nearby records in proximity of the selected record based on time or distance. 
You can define distance either in miles or kilometers as well as time in minutes.
You can also perform concentric proximity search based on distance with three different values.
Here on defining search criteria of 75, 85,95 Miles, it will plot records situated in 75, 85, 95 Miles area from current pin location.
Also, you can search in proximity from single entry as well. 
On hovering over pin, you get details as configured along with travel distance in case of search based on distance. And travel time in case of search based on time. 
Note: When proximity search is to be done on basis of time, at max you can define 85 minutes.