A service providing vessel operators with recommended routes based on forecast weather and sea conditions to optimise safety and economy.
In practice
The OOW and master use weather routing recommendations as advisory inputs, not mandatory routes: the master's overriding authority and responsibility for the vessel's safety is unaffected. On passage, the routing service issues updated forecasts and may revise its recommendation if the weather pattern changes significantly. The bridge team must compare the recommended route against current chart datum, piracy risk areas, ice limits, and any traffic separation schemes. ECDIS systems increasingly integrate weather overlay data, allowing the OOW to visualise forecast conditions along the planned track and make informed judgements about route adjustments in real time.
Regulatory detail & full definition
Weather routing is the service of advising a vessel operator on the safest and most efficient ocean route based on analysis of forecast weather and sea conditions over the anticipated voyage period. Commercial weather routing companies use numerical weather prediction models, wave forecasts, and vessel-specific performance data to recommend an alternative to the great-circle or rhumb-line route that minimises voyage time, fuel consumption, or cargo risk. The Admiralty Manual of Navigation and IMO guidelines on passage planning under SOLAS Chapter V, Regulation 34 both encourage use of routing services for ocean passages.
The OOW and master use weather routing recommendations as advisory inputs, not mandatory routes: the master's overriding authority and responsibility for the vessel's safety is unaffected. On passage, the routing service issues updated forecasts and may revise its recommendation if the weather pattern changes significantly. The bridge team must compare the recommended route against current chart datum, piracy risk areas, ice limits, and any traffic separation schemes. ECDIS systems increasingly integrate weather overlay data, allowing the OOW to visualise forecast conditions along the planned track and make informed judgements about route adjustments in real time.
Source: Industry usage; SOLAS Ch. V Reg. 34 (passage planning)
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