Using Live Wind Data in the App
Display the port or starboard tack first, with a new < > button at the bottom left of the charts screen (see screenshot below). Very handy for avoiding obstructions. If your optimal tacks are symmetric, you can also let the app automatically display the tack that is closest to your current heading.
How to share a screenshot or just the graph. The screenshot above is taken on an iPad/iPhone by pressing the On/Off button and the round Home button for a second at the same time (you'll hear a snapshot sound). Then go to the Photos app where you'll find the screenshot, which you can email. This approach is nice because it shows both your GPS track, the map of your location, and your boat and wind speeds for the day. Pretty cool. However, if you don't want the background, you can quickly email the graph alone from within the Sailtimer app, as in the example below. The graph below was made at the same time as the screenshot above, so you'll notice that the lines are the same. To get the graph without the background, just press the Email button in the top right corner, and email it to yourself or share it with others.
Polar learning: Generate custom polar plots for your unique sailboat. Polar plots or tables show your boat speed in all wind directions and wind speeds. Until now, it has been difficult to get polar plots from a velocity prediction simulation or manufacturer; they don't exist for many models of boats, and are expensive to purchase at sources such as this one. But as shown in the screenshot below, with a low-cost in-app purchase, the SailTimer app (and Charts Edition) can now easily learn the custom polars for your individual sailboat. This is a major advancement in sailing technology. Once the app knows the speed profile for your individual boat on all points of sail, it can give more accurate tacking results. This actual data for your individual boat is far more accurate than generic polar "targets" for all boats of the same model. They assume that every boat of the same model has the same speed profile (whether clean for racing, or full of cruising gear), and are based on estimates rather than empirical data.
You can see where it says that new polar data was saved, in the bottom of the panel on the above screenshot. There are also times when no learning should occur, such as when you are motoring straight into the wind, tied up at the dock, swinging at anchor, and for example when you are tacking. The app therefore follows our Rules for Intelligent Polar Learning... If the conditions are not stable (e.g. you are changing headings while tacking) or you are heading straight into the wind or nearly stopped, then you will see a note at the bottom of the panel giving you feedback that polar data is not currently being saved.
Save multiple polars. If you want to save different polars for different sail combinations, or for testing, racing or different conditions, this is another advanced feature that SailTimer makes really easy. In the panel below, you can see that you can toggle the polar learning on or off. You can also can save (or delete) lots of different polars, and select the one you want to use. You could save polars for sailing with main and jib, and a different polar for using main and genoa. That way, when you want your optimal tacks and Tacking Time to Destination, if you select the polar for the sails you are using, you will get the most accurate tacking results. That's another innovative new feature that is available in the SailTimer app, but not in any GPS chartplotter.
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