Online maps and modem: what they have in common

1. Step 1. Online maps — uses — GPS (satellite navigation). The position.
2. Step 2. GPS (satellite navigation) — is part of — Self-driving car. Satellite navigation.
3. Step 3. Self-driving car — has part — Lidar. Lidar builds a 3D map of the surroundings.
4. Step 4. Lidar — has part — Photodiode. A receiver of reflected light.
5. Step 5. Photodiode — is used in — Fax. Scanning with a photocell.
6. Step 6. Fax — has part — Modem. It transmits an image over a telephone line.

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