Woodwind key mechanism and GPS (satellite navigation): what they have in common

1. Step 1. Woodwind key mechanism — is part of — Flute. Boehm’s keys close the holes.
2. Step 2. Flute — uses — Resonance. Resonance of the air column.
3. Step 3. Resonance — is used in — Quartz clock. Resonance of the crystal.
4. Step 4. Quartz clock — evolved into — Atomic clock. The quartz oscillator is tuned to an atomic standard.
5. Step 5. Atomic clock — is used in — GPS (satellite navigation). The satellites carry atomic clocks; the position is calculated from signal arrival times.

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