To run a weather route on the website, it is as easy as dragging and dropping your start / end waypoints and hit calculate. Then you will see four optimal weather routes using the most recent forecasts to optimize your passage.
On the PredictWind Forecast website go to Tools. Then weather routing to open up the weather routing page. This feature is only available for Standard and Professional PredictWind users.
At the top of the page you can select "Routing Preferences". This is where you can set up the Performance polars for your boat. Polars are very important for the weather router to be able to give a more accurate reflection of your boat position as it travels through the weather systems. You can select a Predefined Polar from the list. Or use the Sail option, which is a basic polar set up if your boat is not on the predefined list or there is not a similar performing design. Power is for Power boat routing setup. We also have an Advanced option where you can create your advanced polars in a table format to gain more accuracy.
Once selected the Polar will then remain in place across all PredictWind Apps including the Offshore App. To save this option you must click on "Calculate" for the weather routing. For making adjustments to the polar on all platforms you have the option to adjust the polar speed by a percentage. If, for example, you are delivering a boat short handed and expect the boat performance to be slow by 20%, please apply 80% to the Polar Speed Adjustments.
You can also set up a motoring option for light winds. The router will assume we are motoring directly toward the destination, when the wind speed is below our motoring setting.
Professional users can also turn on Ocean and Tidal currents.
The Other main feature in the Routing is the choice of routing for the “fastest route” or "comfort". In the Comfort setting, we can select parameters that the router will try to avoid. The minimum parameters are 25 knots and 3 metre swell waves.
Once this is set up at the top of the page click on 'Weather Routing" return to the map.
You can drag and drop the green start waypoint and the red finish waypoint to your desired locations, we could also position these using gps coordinates by clicking on the waypoint icon, and entering the Latitude/Longitude in the Degrees decimal minutes format. Ensure your waypoints are well in the water.
You are now ready to calculate your weather route, click on "Calculate". Your route will be calculated using your Polars and will show 4 routes which relate to the 4 weather models. PWG is blue. PWE is Red. GFS is Green and the ECMWF is yellow. When you select the weather model from the bottom left the grib files that are displayed relate to that model and that route. For example if you select the PWE model, this corresponds to the red track.
To animate the route press the play button, you can also control the display with the time slider ball, or the forward and back arrows.
At the bottom of the page we have our display controls, we have wind barbs with colour contours, wind arrows with colour contours and coloured arrows.
You can also view Rain, Cloud, Air temperature, Gust, Cape and Wave, on any of the maps if we hover our mouse pointer over the map we get detailed data for that point on the map.
By clicking on any point on a weather route we get detail for that point on the weather route.
At the top of the screen, click on Tables, this has detailed data of our weather routes for all models. We have Graphs. Wind. Summary. Route. Swell. And Current. We also have the export function which allows us to export the weather route in 2 digital formats to be used in Navigation software, we can also print the details of the route.
See below the wind angles we use to define upwind/reaching/downwind.
% time upwind = True Wind Angle is 55 degrees or less.
% time reaching = True Wind Angle is between 55 degrees and 135 degrees.
% time downwind = True Wind Angle is 135 degrees or more.
Click on the Map button to go back to the weather routing Map.
For further explanation please watch the video above.
Please click here for more information.