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.
Voyage cost model
Total voyage cost is fuel + charter + canals + optional carbon + port/agency. Six vessel profiles (Heavy Lift, MPP, Container, Bulk, RoRo, Custom) supply default speeds (Eco / Normal / Fast), main-engine burn at normal speed, auxiliary / hotel burn, ballast factor, and charter defaults. MPP and Custom use rounded main-engine rates at the Eco / Normal / Fast presets (13.5 / 22 / 34 t/day at 11 / 13 / 15 kn); other profiles and non-preset speeds scale main-engine burn with the cube of the speed ratio versus the profile's normal speed. Aux / hotel load is added separately and is not cubed. CO₂ uses IMO default factors (VLSFO 3.114 / MGO 3.206 t CO₂ per t fuel). Weather delay hours from the route-weather forecast are added into steaming days when available. Figures are indicative only — not a bunker quote.
What is heuristic
Transit days and cost bands use the voyage model with the default MPP profile until you change vessel, fuel price, charter rate, or speed on the planner. 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. The /analysis report may request a DeepSeek narrative for the recommendation — numbers stay deterministic; the model only writes prose. Failures keep template copy and baselines.
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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