
Your cell phone knows where you are through triangulation. A Hungary-based company called Leonar3Do has taken that principle and applied it to a 3D mouse: by integrating several antennae into the form factor, a reading device can determine, with pinpoint accuracy, exactly where the mouse is in space. Have a look:
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Perhaps, you have an uniquely smart and capable phone with a directional antenna inside, but the rest of our phones determine their positions via multilateration, and not triangulation )
Had one thirty years ago. Polhemus Navigation Sciences 3space tracker. $25000 back then.