I assume TIS-B is not available in Europe otherwise wouldn’t it be beneficial also in Europe to rebroadcast non ADS-B transponder equipped aircraft like gliders? Or in Europe there are no exceptions so all gliders have ADS-B? Otherwise there is an advantage to the US TIS-B as we can now see most gliders which are only equipped with transponders.

Ramy

On Thursday, January 14, 2021 at 6:12:27 AM UTC-8, Urban Mäder wrote:
On Thursday, January 14, 2021 at 8:23:00 AM UTC+1, wrote:
Moshe,

Only TIS-B has position uncertainty from the imprecision of SSR, which varies with the distance from the radar station. Both ADS-R and TIS-B have some position error from delay introduced by the reception-processing-rebroadcast sequence. ADS-B is not designed for close proximity collision warning - it's more a traffic separation tool - 5 miles and 1000 feet. I believe you can get ADS-R/TIS-B traffic alerts at, say, 1 mile, depending on on your display.
Yes. We will try enabling traffic alerts for ADS-R, but I'm a bit reluctant since correctly detecting tow trains may be hard, given the (uncertain) time delay.

Honestly, the dual-ADS-B setup in the US - of which ADS-R/TIS-B is the consequence - is a surprisingly complex beast. We're thus happy to hear your feedback, preferably with IGC log files sent along to .

Thanks
- Urban