JS wrote:
Apparently two aircraft squawking VFR are visually reported as a
conflict but do not have the same level of alert.
Close to another aircraft could be:
On tow behind a transponder-equipped towplane.
Sharing a thermal.
Pair flying.
Not that gliders ever do any of that.
So as we're all moving toward using radios and transponders to keep
separation, be aware of the havoc we may be wreaking at ATC. Not a
good way to make friends! If you're Mode S, they have your
registration too!
No "havoc" is created by two transponders sqawking 1200 near each other.
It can cause signal scrambling problems so the Mode C altitude data is
not read reliably, but ATC still knows where you are! Mode S
transponders can alleviate this problem.

--
Eric Greenwell - Washington State, USA (netto to net to email me)