Hi Moritz

I commit a new arrow for wind, I just add in seapassagelistener.cc after
  if (wind_increment != 0)
  {
     windrose->yaw(Degree(wind_increment));
     wind_increment = 0;
  }

This line so it resize the arrow as the wind changes, have a look Im not fully convinced...

  windrose->setScale(wind_strength/3,1,wind_strength/3);

Wind is 0 to 10 right?


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