Paul is correct. Distance is determined by the relative strength of
the EMP (electro-magnetic pulse) from the strike, based on
statistically averaged historical lighting EMP emissions data. Most
stikes get placed close enough to the proper distance on the screen to
provide useful data. Direction is determined using directional
antennas.

Dean Wilkinson
B.S.E.E.

(Paul Tomblin) wrote in message ...
In a previous article, (Dave Jacobowitz) said:
But how do you get distance? All I can think of is having multiple

I'm pretty sure they guess the distance based on the strength. So a very
strong strike will show as closer than it really is, and a weak one will
show further away.