Soaring Cafe had a link to a podcast about FLARM that I found very interesting. The link is http://omegataupodcast.net/2014/03/143- ... ith-flarm/ and runs a little over an hour. It describes the development of FLARM, and the development of PowerFLARM. It is worth listening to if you are curious about anti-collision warning. Since the podcast is intended for people who don't know FLARM, it starts with the basics and builds from there. Recommended.