Most routing systems use one weather forecast across the entire route, treating it as equally accurate at every point along the way. In practice, forecast accuracy varies by location, terrain, and time. A model that is reliable in aggregate can be systematically off at a specific point of the corridor. Maritimo corrects for this variation. At each point along the route, a dedicated calibrator measures how the upstream forecast has been performing against actual observations, and applies the correction before the routing layer. The system runs this correction every hour, so the forecast underneath a Maritimo decision is never the raw model output; it is the model output corrected against the most recent inputs at every point the vessel will cross.

A route is not one forecasting problem. It is a thousand forecasting problems, each with its own error pattern. Maritimo is built around that structure. Location-specific calibrators run independently on their own compute, refreshed every hour, and the routing optimisation runs over the corrected field they produce. Where traditional routing ends, Maritimo begins.

Every voyage operates inside a corridor of admissible routes, bounded by safety, schedule, and operational constraints. Existing routing systems consume the upstream forecast as-is; the weather along the corridor varies as the upstream model reports it, but the accuracy of that variation is not measured at any specific point. Maritimo treats each point of the corridor as a separate forecasting problem. A dedicated calibrator at each point measures how the upstream forecast has been performing against observations at that specific location, and applies the correction before the routing layer computes over it.

The system recomposes itself every cycle. Forecast precision at any given point of the corridor reflects that point's own observation record and correction mechanism. Routing decisions are made over this point-wise calibrated field, recomputed at every cycle as the field itself is recomputed.

The map below shows the corridor for the selected voyage, the space of admissible routes, populated by the calibrated weather field. Each point is a forecasting node with its own calibrator, refreshed hourly against the latest observations at that location. The optimisation layer reads across these nodes and computes the route that produces the lowest fuel cost while remaining within operational limits. When adverse conditions appear at any point in the corridor, they are the conditions the recommendation is being computed against for that segment of the voyage.

Every voyage this fleet has sailed is a data point Maritimo can be tested against. For each completed voyage, the system computes the recommendation it would have produced at every cycle of that voyage, using only the forecasts and observations available at each moment. The recommendation is compared to the route actually sailed and the fuel actually burned. The system is not shown the outcome. It is shown the voyage as it unfolded, and asked what it would have decided.