Weather routing

We are using weather routing, a PredictWind feature. I think PW recently improved their algorithms because (March 24) I like their routes beter that before.

I simple copied an email explaining a lot. And yes some of it is commercial. We use the Offshore app while en route, have the Standard subscription and no Data Hub and it works well.

A last tip not in the video: Do get new weather routing daily when retrieving your grib files. Adjust your starting point, green marker, to your current position and set the starting time to Now.

PS We are experiencing a bug in the Offshore app, our current GPS position is not showing at startup. The work around is start Google Maps, it wil get a fix and then it’s also available in the PW Offshore app.

Keep comparing real weather to the models, especially the direction, to find the best prediction model. That’s also your preferred weather routing model.

Hi there

Thanks for registering or participating in the Weather Routing for Sail Boats Webinar recorded 25th March 2024. Click Here for the link to the Video on YouTube.
This webinar covered:An introduction to PredictWind App and website, Offshore App, Weather Models and how to use Weather Routing.

Weather Routing Features: Polars, Wave Routing, GMDSS maps, AIS while Offshore, Extreme Weather warnings, Current Maps, and ECMWF long-range forecast.Below, we answer the 7 most commonly asked questions:What are boat polars, and how do I set them up?How do I set up wave polars?What is the difference between the PredictWind App/ website and the Offshore App?Why should I get a professional subscription to PredictWind?What is a Datahub, and why do I need one?Can I get more information on the new AIS and GMDSS/ Extreme Weather Warnings features?What is CAPE, and how can I predict severe weather?

1/ What are boat polars, and how do I set them up?
Polars describe your boat speed and wind angle in any given weather situation. Setting the polars in your PredictWind account is essential for an accurate weather route. It is vital you set the polars in your account before using the weather routing and departure planning tool on any of the PredictWind platforms.See the help at for detailed instructions on setting up boat polars.

2/ How do I set up wave polars?
With PredictWind Weather Routing, you can set your Wave Polar not only to define the performance of your boat in various wave conditions but also to view the Roll, Vertical acceleration and Slamming Incidence that your boat will experience through the route. See more information at

3/ What is the difference between the PredictWind App/ website and the Offshore App?
There are multiple ways you can view a PredictWind forecast:The PredictWind website is used on your PC/ Mac using a web browser like Chrome or Safari. You need highspeed internet services to use this. It is location-based, i.e. you add your location, and we generate a forecast for that spot. This is our primary platform for subscription management, billing, and setting boat polars.The PredictWind App is installed on your mobile device and is an online tool. It needs Wi-Fi or a cellular connection to view the forecast. It is location-based, i.e. you add your location, and we generate a forecast for that spot.You can use the PredictWind Offshore App on PC, Mac, Apple or Android devices. It is an offline tool for downloading compressed GRIB file weather data and weather routing via an internet or cellular connection, at sea via Starlink, satellite like the Iridium GO/ Exec or email request. It stores files locally on the device to review offline.

4/ Why should I get a professional subscription to PredictWind?The professional package gives you access to the best data that PredictWind has to offer and allows access to the following:Ocean current GRIBs (Mercator, Hycom and RTOFS)High-resolution forecast GRIB files (1km and 8km PWG/PWE, 9km ECMWF, 27km GFS, 14km SPIRE & 10km UKMO)Sea Surface Temperature (SST).High-resolution tidal currentsWave modelling of your boat (including Roll, Vertical acceleration and Slamming Incidence). Please learn more with this 1min video.AIS data in the Offshore App, accessible via satellite when offshore. Please learn more with this 1min video.Any weather route or departure plan calculation using either the Standard or Professional subscriptions will consider your choice of ocean current data and wave polars when calculating a route. However, only the Professional subscription will show you these details when viewing the results in the tables and along the routes.Click here to upgrade your subscription.

5. What is a Datahub, and why do I need one?The DataHub is your all-in-one GPS tracking, data management, and communication solution. Whether you’re offshore or inshore, it seamlessly handles your GPS tracking, data sharing, and communications. It can switch from satellite to cellular when needed, ensuring your tracking page stays current. Plus, it offers features like firewall protection, PredictMail, Over the Horizon AIS, generating AI boat polars, accessing N2K data, and broadcasting GPS and AIS. There are no ongoing fees or contracts with the DataHub, just the requirement of a standard or professional PredictWind forecast subscription for GPS tracking services. More information about the DataHub can be found at

6/ Can I get more information on the new AIS and GMDSS/ Extreme Weather Warnings features?AIS – You can now access AIS vessel position reports worldwide. Review this article here.You can now visually view the GMDSS text forecast on any weather map. Click here for more information.

7/ What is CAPE, and how can I predict severe weather?CAPE stands for Convective Available Potential Energy and is the amount of fuel available to a developing thunderstorm. More specifically, it describes the atmosphere’s instability and approximates updraft strength within a thunderstorm. So, CAPE is used by weather officials to understand what the potential might be for thunderstorms and how powerful those storms might become if they do materialize. The standard measurement of energy is represented as Joules Per Kilogram. Weather experts might also express A high CAPE value using the term “high instability”. When we talk about a highly unstable atmosphere, CAPE values are usually more than 2500 J/kg, which would supply ample energy for strong updrafts and violent thunderstorms, should they develop. You can learn more about CAPE and other indicators for predicting severe weather here.

We have an extensive Help Centre at which would be worth taking the time to look at. If you have any other questions or concerns please do not hesitate to start a new conversation at  or by emailing us at
Copied email

Preparations and circumnavigation of a Seawind 1260