Weathernews launches offline navigation mode

Weathernews has introduced an offline mode for its AI-powered SeaNavigator for Master service, enabling ship masters to access stored weather forecasts and passage plans when onboard internet connectivity is interrupted.

The new capability follows onboard trials conducted between February and April 2026, during which masters highlighted unreliable satellite connections as a significant obstacle to using live weather intelligence. Reported problems included weak VSAT coverage in the southern Hemisphere, latency exceeding 1,000 milliseconds and restrictions on satellite services in some coastal waters.

“Too many digital tools are still designed as though the network will never go down. Offline mode starts from the opposite assumption,” said Craig West, chief executive Europe at Weathernews. “If the link drops in the middle of a weather decision, the master still has the forecast, the planned route and a clear view of how current that data is.”

Offline mode allows crews to pre-download weather information for selected sea areas, choosing forecast periods of up to approximately 14 days through a companion application called Data Mirror Manager. Available information includes wave heights, swell, storm data, weather charts, typhoon tracks, wind and ocean currents.

Downloads can be scheduled up to four times daily to incorporate updated forecasts, while estimated file sizes allow crews to manage available bandwidth. When connectivity is lost, SeaNavigator automatically switches to stored information, allowing masters to review their Active Passage Plan and alternative routes alongside the downloaded forecasts.

The application displays the timestamp of each update, helping bridge teams assess the currency of the information. Live data is automatically restored when connectivity returns.

However, route simulation and the AI Agent still require an internet connection and are unavailable in Offline mode.

Launched in December 2025, SeaNavigator for Master supports route assessment, weather risk analysis and voyage planning. Offline mode is available now through a new desktop application, installable using a shore connection or USB drive where onboard downloads are impractical.