Lightning Detector

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Unfortunately to do something like that you would need a minimum of 3 stations more advanced with directional antenna send the data via the Internet and triangulate them. 

I was thinking more just direction and distance, which could be done with four antennas for direction, and the sensor's own distance sensor. You just detect the small phase difference in the received spike from the lightning on the four antennas, and you would have your direction. If this is really being used on a cruising boat, you don't need all that much accuracy, as typically it's not that hard to see where the thunderstorms are forming.