Gyrocompass and gutenberg printing press: what they have in common

1. Step 1. Gyrocompass — evolved from — Compass. A compass without a magnet.
2. Step 2. Compass — is part of — Sailing ship. A magnetic compass.
3. Step 3. Sailing ship — uses — Mercator projection. Navigating along straight rhumb lines.
4. Step 4. Mercator projection — uses — Gutenberg printing press. Maps were printed in large numbers.

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