When I joined the "Wonderful Sail 2 Indonesia" I thought it would be fun to keep track of the other participants. I upgraded my Marine Traffic account and added all the boats. It turned out to be a bust as there are almost no Internet linked AIS receivers in Indonesia. But wait, there's more.
Near the end of the three month rally I was sitting with the Government representative. I casually said: "I wonder where boat 'x' is?" He opened his phone, scrolled down, and told me. He knew, and known, where every boat in the rally was every day. Don't ever think that you are incognito.