Methodology
How corridor estimates are produced — and what they are not.
Geometry follows the Eurostat Marnet maritime network via searoute. Transit assumes ~14 kn average speed. Modeled risk starts as rule-based baselines from passages and distance; curated issue records (chokepoints and advisories) may refine scores and narrative when matched. Optional AI analysis can be re-enabled by operators. Scores are illustrative — not navigational advice or a booking quote.
Modeled risk bands (0–10)
- Low · 0–3
- Moderate · 3–5
- Elevated · 5–7
- High · 7–10
Two corridors can share a band (e.g. High) while numeric scores still differ — prefer the number for fine comparison.
- Network eurostat-marnet-2025 · searoute-ts
- Data quality: Baseline heuristics (rule-based)
What is deterministic
Port positions and network path geometry come from curated ports plus the Eurostat Marnet graph via searoute. Distance (nm/km) is derived from that geometry.
What is heuristic
Transit days assume ~14 kn average speed. Baseline modeled risk bumps scores from known chokepoints and diversions. These appear immediately as Baseline quality.
What may be curated or AI-assisted
Optional analysis matches corridors to a curated issue database (chokepoints, advisories) without sending full map geometry. When matched, cards show Issues applied. Operators may re-enable AI analysis separately. Failures keep baselines and offer a scoped retry.
Data providers
Maritime network: Eurostat Marnet (via searoute). Map tiles: Esri ArcGIS Online and CARTO (browser requests). Risk narrative: operator-maintained issue database (and optional AI when enabled).
Limitations
NoMap is an overview tool — not voyage planning, insurance advice, or a freight quote. Always verify with operational sources before decisions.
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