Abstract: A proximity monitor includes an electronic processor, a proximity detector, and a memory. The proximity detector is to receive a proximity signal, and the electronic processor is to determine a time-of flight measurement for the proximity signal, determine a proximity measure based on the time-of-flight, identify a proximity event based on the proximity measure, and store a leg entry for the proximity event in the memory, the log entry identifying a first identifier associated with the proximity monitor and a second identifier associated with a sender of the proximity signal.