PeterACox

Thanks rtrbt for your replies.  I am sorry, I didn't make my question clear enough. 

I was asking whether the sensor has the ability to measure the true cardinal direction (and therefore must have an inbuilt compass or some sort) or whether I have to make a correction in my data collection program to take account of the installed orientation of the hardware.

Does the Outdoor Weather Station Wind Direction Sensor need to be calibrated to account for the orientation of the hardware when it has been installed?