At 00:07 30 November 2015, jfitch wrote:
It seemed as though (2) was being offered as an explanation for
(1). If not because of the difference between track and heading,
then why? I am still curious why you get these and I don't (nor
anyone else I know), and never
have, aren't you? Perhaps we can learn something here. My
experience is all with PowerFlarm, different algorithm? Better GPS?
All the warnings I have
ever gotten in thermals where someone right ahead or right
behind, or turning the other direction.

Perhaps it is a difference between Flarm and Powerflarm, although
I would be surprised if they were using different algorithms. As for
my curiosity, I had not (until your comments) come across a view
different from my own (about the incessant false collision alerts
while thermalling). Note the recent coincidental post at
http://uras.gliderpilot.net/?op=s2&id=50680&vt=
(BTW the poster is unknown to me!)
J.