Sonar is the system we use to measure latency from the client devices to all of our PoPs. Cartographer is the system that consumes all of these sonar measureme

Sonar is the system we use to measure latency from the client devices to all of our PoPs. Cartographer is the system that consumes all of these sonar measurements and uses several other real time data sources (BGP routes, Link capacity, PoP health, PoP capacity, etc) and continually generates a GLB map for the most optimal targetting of requests to our PoPs.