In article .com,
Paul kgyy wrote:

Someone asked a while back what the source was for the opinion that XM
shows only cloud to ground lightning.

This is explicitly stated in the XM manual that came with my new 396.

Most weather providers obtain lightning data from the National Lightning
Detection Network, which is operated by Vaisala. The network displays
cloud to ground strikes.

WSI uses data from their own lightning detection network, which can
detect both cloud to cloud and cloud to ground. I'm not sure what their
InFlight product displays.

In any case, both products pale in comparison to sferics devices for
in-flight lightning detection.


JKG