[ptudan]

Pretty sure tinder just makes the minimum miles away shown to be 2 miles. Simply one if statement.

[flutas]

Tinder actually has a fairly interesting solution to this, they divide the world up into mile grids and use those. Funnily enough, a blog post by the same writer as OPs link.

https://robertheaton.com/2018/07/09/how-tinder-keeps-your-lo...

[InitialLastName]

You need to dither that by a half-mile as well so that the baddies can't use the border between e.g. 2 and 3 miles to do the same test.

[nomel]

This is a trick I use when doing competitive analysis for a certain type of sensor. I need to measure the amount of noise in the system, but a dead-band or quantization is almost always included. So, I insert a signal that bumps up against the boundaries of the dead-band or quantization. Doing this repeatedly gives me a sampling of the noise.