Portolan Charts & Maritime Navigation
Highly accurate nautical charts with a grid of rhumb lines, used with the compass for precise sea navigation, especially in the Mediterranean.
Core metadata
- ID: portolan_charts_maritime_navigation
- Era: Medieval
- First known date: 1290 (decade)
- Region: Mediterranean / Italian and Catalan charting traditions
- Review status: source_checked
- Maturity: N/A
Prerequisites
- Astrolabe & Quadrant (astrolabe_quadrant)
- Basic Cartography (basic_cartography)
- Compass (compass)
- Mathematics (mathematics)
- Navigation (navigation)
- Writing (writing)
Dependents
Fields
- None.
Node sources
- Portolan Charts (Library of Congress, 2026, official_agency) • Supports: node
Prerequisite edge evidence
Edge/source evidence summary:
- Prerequisite edges: 6
- Average edge confidence: 70%
- Prerequisite sources: 5
- expert_inference: 6
| Prerequisite | Type | Confidence | Evidence level | Note | Sources |
|---|---|---|---|---|---|
| Compass (compass) | enabling | 68% | expert_inference | Compass provides a capability that enables this technology without being the only possible path. |
|
| Basic Cartography (basic_cartography) | historical_predecessor | 75% | expert_inference | Basic Cartography is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
| Navigation (navigation) | enabling | 68% | expert_inference | Navigation provides a capability that enables this technology without being the only possible path. |
|
| Astrolabe & Quadrant (astrolabe_quadrant) | enabling | 68% | expert_inference | Astrolabe & Quadrant provides a capability that enables this technology without being the only possible path. | No sources recorded. |
| Writing (writing) | historical_predecessor | 75% | expert_inference | Writing is an earlier historical predecessor or foundation, not a one-to-one engineering dependency. |
|
| Mathematics (mathematics) | enabling | 68% | expert_inference | Mathematics provides a capability that enables this technology without being the only possible path. |
|
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