Catapult and GPS (satellite navigation): what they have in common

1. Step 1. Catapult — is made of — Sinew. Torsion springs were twisted from sinew.
2. Step 2. Sinew — is material for — Tennis racket. The strings are natural gut.
3. Step 3. Tennis racket — is made of — Carbon fibre. Modern frames.
4. Step 4. Carbon fibre — is material for — Military drone. The airframe is composite.
5. Step 5. Military drone — has part — GPS (satellite navigation). Satellite navigation.

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