Make eye contact? Nod? Speak? Ignore them?
To qualify that, do you live in a city, town, or rural area?
"And while the crew followed his order, they all thought he was crazy. They knew that one ping would tell them only part of the picture, it would take several pings to calculate the distance, speed, and direction of the enemy. Things you need if you want a torpedo to actually hit something.
So, while it might be fun to sit at the command prompt and ping at one target or another while pretending to be the Russian Captain of movie from the 90's, don't expect to get information you need to attack the problem."
https://www.pingplotter.com/wisdom/article/continuous-ping.html