Map and electric fan: what they have in common

1. Step 1. Map — evolved into — GPS (satellite navigation). Digital navigation on a map.
2. Step 2. GPS (satellite navigation) — is part of — Military drone. Satellite navigation.
3. Step 3. Military drone — works like — Quadcopter (drone). The same principles of uncrewed flight in civilian and military versions.
4. Step 4. Quadcopter (drone) — has part — Propeller. Air propellers.
5. Step 5. Propeller — is part of — Electric fan. The blades.

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