In other matters I believe IGC do not approve or disapprove, nor do they
specify.

The IGC ANDS committee disapproves of the current FLARM position. I am not sure if this has yet evolved to be the official IGC position on the topic.

http://www.fai.org/downloads/igc/IGC...lenary_AX6_2_4

Personally, I don't share the opinion of the ANDS committee