GPS (satellite navigation) and headphones: what they have in common

1. Step 1. GPS (satellite navigation) — uses — Atomic clock. The satellites carry atomic clocks; the position is calculated from signal arrival times.
2. Step 2. Atomic clock — has part — Oscillator. A quartz oscillator is tuned to the atoms.
3. Step 3. Oscillator — is part of — Audiometer. A tone generator.
4. Step 4. Audiometer — has part — Headphones. Headphones.

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