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Do you really want someone to be able to easily determine your daily routines?

Remember that GPS is not the only source for location information. Geolocated Wifi SSIDs, geolocated IPs and geolocated cell tower locations make location tracking peanuts for sufficiently large companies.

Try finding your favorite WiFi-networks here: https://wigle.net/
Cell tower database: https://opencellid.org/

You can bet your ass that (semi-)static IPs are geolocated using that data as well.

In fact, there's already something similar: http://wiki.opencellid.org/wik... and probably https://github.com/SecUpwN/And...

Actually yes, assuming you have a phone (or similar) with GPS.

There are a couple of projects collecting locations of cell phone towers and wifi hotspots to allow geolocation to devices without GPS and faster geolocation for with GPS. Having opensource databases means you can do lookup without having to report your location to a google/apple/nokia and means you can do offline look ups. See https://location.services.mozi... or http://wiki.opencellid.org/wik... or http://openbmap.org/

If you are cycling on cycle paths, then you could record GPS traces and upload them to openstreet map. That will require a bit of time on the computer, but the valuable work is the actual recording.

As each cell has a CID (Cell ID) you can get software which will display this, and other, information.
If you know what the CID should be for a specific area then you can restrict your phone use if you don't recognise the CID.

eg. 2 phones - one a burner you NEVER use, but is always on so you can track the CID,
Your main phone you only switch on when you trust the CID of the cell you're in to make the calls.

A public database of Cell ID - http://opencellid.org/ Its a little out on some of its info, but its a good starting point.

Spidey is a stingray detector app developed by the ACLU and MIT. This page is a page to get notified when it goes live. The source code is on GitHub. It works by comparing the towers you can see at any given moment against what you've seen before and data from the OpenCellID Project.

Who watches the watchers? I do.

It is trying to build a public (or so it says) database of where there is cell towers and or wifi, all geolocated by GPS.

For cell towers, there alredy exists such a database:

OpenCellID.org

There are numerous client apps for Android (e.g. Tower Collector) that allow you collect logs of GPS coordinates+visible tower cell IDs and submit these logs to OpenCellID.

Ah, yeah, I guess if you're a third party then you'd need some way to report the information back.

Incidentally, have you seen OpenCellID?

Two truly open initiatives offering back the crowdsourced data to everyone (it doesn't seem to be the case with OpenSignalMaps): OpenCellID.org and openBmap.org.

If you walk around then your mobile logs at least into one mobile cell. If there are three cells around you then you can do triangulation. There's an open source project that can make use of this data from within your mobile: http://opencellid.org/