Triangulation and radio: what they have in common

1. Step 1. Triangulation — is used in — Map. Surveying.
2. Step 2. Map — evolved into — GPS (satellite navigation). Digital navigation on a map.
3. Step 3. GPS (satellite navigation) — evolved from — Radio navigation. Satellite radio navigation.
4. Step 4. Radio navigation — uses — Radio. Radio beacons.

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