I do something similar to that. There is an activity I engage in on the coastlines that routinely results in 911 being called. I'm not doing anything illegal or that endangers anyone else, but it gets people excited. If I don't head it off in advance, when I look towards the shoreline it is not unusual for me to see patrol cars and fire engines with flashing lights waiting for me when I come ashore, or LEOs headed out to sea in my direction. Once the ball starts rolling it is hard to stop it. A procedure I use eliminates the risk and gives me a documented defense if I should be questioned later. Pilots should not have to do this, but it can be useful when flying near nuclear plants, chemical plants, oil refineries, open air assemblies, or any other sensitive targets. LEOs suggested that we use do this and it has worked for us so far:
Do not call 911. But before arriving, do call the Non-Emergency Number for 911. Give them your info directly and ask them not to dispatch. I call or visit the Coast Guard station separately. It works for me.
Bob Ridpath is a 911 dispatcher. He might be able to provide some insight into this proactive prevention procedure.
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