1. Section: View, compare and draw polar plots.

1. Use the "select file" to upload .pol files and draw the polar plot. Each .pol file is draw in its own color.
2. See the cursor position as TWS, TWA and boat speed below the diagram. If you click an the plot, that the value is captured for the given configuration.
3. Choose the TWS you draw with the pulldown menu below the plot.
4. With the "export svg" you can get the plot as SVG graphics.
5. With "export .pol" you can get a interpolated standard .plot file from you darwings.
6. Reload page if you want to restart.


2. Section: Compute polar plots from boat messurement.

1. Use the "select file" button to upload the messurement data.
2. ...


Explanation:
kn: knot as unit of nautic speed.
TWS: true wind speed, speed of wind derived from a weather forcast or computed (link).
TWA: true wind angle, direction of wind relative to the boat.
BS: boat speed (also BSP), is a value of speed free of the effect of current.
SOG: speed over ground, messured (GPS - relative to land or other external position) speed value, that includes the effect of current.
STW: speed throug water, messured with a dopple log or a log wheele, is the boat speed relative to the water including the effect of current.
Angels: 180° - vor dem Wind, 90° - halber Wind, 0° - im Wind