Compasses and rope: what they have in common

1. Step 1. Compasses — is used in — Mercator projection. The map grid was built with compasses and a ruler.
2. Step 2. Mercator projection — is used in — Sailing ship. Navigating along straight rhumb lines.
3. Step 3. Sailing ship — has part — Anchor. An anchor.
4. Step 4. Anchor — is used in — Anchor windlass. It raises the anchor.
5. Step 5. Anchor windlass — uses — Rope. The anchor cable winds onto the drum.

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