@MattL But... but... You've not avoided a threat - you've avoided one possibility of a threat perhaps occurring in the future. A few aircraft 10 miles away are not a threat now
MattL wrote:...under a Traffic service...
Not everybody will have that - certainly not all at the same time, especially on a nice day.
I also don't think that a cost:benefit case for mandatory EC has been made cf all the other things GA pilots could spend their budget on that mitigates hazards more likely to kill them e.g. CFIT, LOC-I.
russp wrote:One of the most useful features of seeing flarm traffic IS seeing them 10 miles plus away
I can see that; it is a strategic rather than tactical use of the tool and is more defensive flight planning rather than direct collision avoidance. You spot the gaggle and re-plan, and likely do it once per flight. Would you prefer to do that on the ground, using a near real time internet data source and re-plan your route at that point - or be continually looking at a screen in the air? FLARM output from the gliders enables both; quite different pilot workloads may ensue from each.