Mercator projection and smartphone: what they have in common

1. Step 1. Mercator projection — is used in — Sailing ship. Navigating along straight rhumb lines.
2. Step 2. Sailing ship — has part — Compass. A magnetic compass.
3. Step 3. Compass — works like — Hall sensor. Both sense the Earth’s magnetic field.
4. Step 4. Hall sensor — is part of — Smartphone. A magnetometer compass.

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