API and atomic clock: what they have in common

1. Step 1. API — is a kind of — Software. An interface between programs.
2. Step 2. Software — includes — Mobile app. Software.
3. Step 3. Mobile app — is used in — Car sharing. Booking.
4. Step 4. Car sharing — uses — GPS tracking. Tracking cars.
5. Step 5. GPS tracking — uses — GPS (satellite navigation). GPS.
6. Step 6. GPS (satellite navigation) — uses — Atomic clock. The satellites carry atomic clocks; the position is calculated from signal arrival times.

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