Analyzing long lat location data to find locations in proximity

I am looking for a tool to analyze location data (long lat values from vehicle GPS available). The goal is to identify locations which are in close proximity (within a circle of 30-60ft) and then average values which are assigned to the different locations. Background is that it should be the same GPS values every time since the vehicle is visiting the same location but due to inaccuracies of the GPS the location slightly varies. I am trying to identify the location data which belongs to the same location. Any suggestions?

PS: First time user, let me know if you need more information.