Davis quadrant and monitor: what they have in common

1. Step 1. Davis quadrant — evolved into — Octant. Reflecting angle gauges.
2. Step 2. Octant — evolved into — Sextant. The sextant is an extended octant.
3. Step 3. Sextant — works like — Star tracker. Navigating by the stars — as sailors did.
4. Step 4. Star tracker — has part — Image sensor. A camera.
5. Step 5. Image sensor — is part of — Security camera. A sensor.
6. Step 6. Security camera — has part — Monitor. A guard watches the camera feed on a monitor.

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