Not sure what size sail to rig? Always choose wrong? Well now you can take the guess work out, armed only with your phone. The new Wind app for the iPhone turns your phone into an anemometer.

Using the microphone to pick up the sound of the wind, the application then converts the noise using complicated algorithms into a surprisingly accurate wind reading. This can then be converted into mph, kmph, Knots or Beaufort.

The price for this ingenious app is just 99ยข!! For more information on the Wind Meter check out www.windapp.com or download it from the apple site.

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