Voyage routing with weather-aware ETA

The Routing tab plans a voyage from departure to destination — great-circle path, waypoint list, weather-aware ETA, and a fuel-burn estimate at any service speed.

Building a route:
1. Pick the vessel and departure/destination ports
2. The system draws the great-circle route and lays in standard waypoints (passing well clear of land at safe distances)
3. Drag any waypoint to adjust the route (e.g. avoid a heavy-weather area, pick a southern routing in winter North Atlantic)
4. Set service speed — the ETA and fuel-burn estimate update live

Weather-aware ETA:
The system pulls a 7-day weather forecast along the route and computes the realistic ETA accounting for headwinds, waves, and current. For a typical transatlantic crossing this can swing the ETA by 12–24 hours either way vs. a calm-sea calculation.

Fuel burn:
For each speed option, the system shows total bunker consumption based on the vessel's specific consumption curve. Slowing down 1 knot can save 8–15% of fuel on a long voyage — Bridge surfaces the trade-off explicitly so the master and the operator can decide together.

Heavy-weather diversion:
If the forecast shows weather above your set comfort threshold (configurable per vessel), the system suggests a diversion and quantifies the time + fuel cost. The master always makes the final call — the routing is decision support, not auto-pilot.