The Age of Exploration: Chapter 1, Exercise 1 — Possible Solution
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THE THREE TECHNOLOGIES
Magnetic compass: adopted from China by the late 12th or early 13th century.
Ship design: Mediterranean carvel hulls fused with Northern European rigging,
giving the full-rigged ship and the caravel.
Navigation tools: astrolabes and improved cartography.

DETAILS THE SOURCE LEAVES OUT (any one)
Who made the cartographic improvements, when the astrolabe was adopted, or
how the compass reached Europe.