Throw your cell phone into the harbor.
or into a faraday cage???
Sounds like the best option to me. I don't use my cell phone for anything other than calls and the occasional text from my doctor, and mail pharmacy. I turned off the majority of the apps on my iPhone when I got it. I never used the Maps app on it, so there wasn't any saved locations or recent ones either. I turned off my location on it quite a while ago, as someone else had posted a similar thread about turning it off.
While you are at it throw the TV, the thermostat, the web cam, the ring camera, and the refrigerator in there, they are monitoring too.