Hi Richard,
Are you saying there were no rings EVER, or Audio messages were not followed with rings ?
I noticed the following yesterday when using skydemon:
There are 3 alert levels for bearingless targets 1, 2 & 3
notice is level 1
warning is level 2
danger is level 3
A few times I had 'traffic notice', but no ring appeared.
messages are sent to the NAV device on 1 second intervals, so it could be the case that if a trigger
is right on the edge, the audio is generated at the point that the 'notice' is registered, but on the 1 second poll interval to the nav device, it has already gone below the threshold again.
Thx
Lee