On Tuesday, June 16, 2015 at 6:54:47 AM UTC-7, wrote:
https://www.federalregister.gov/arti...nt-for-gliders

Can someone briefly explain TABS? From some cursory reading it appears to be a low cost, low featured alternative to ADS-B, using tested but commercial grade GPS receivers. Does it use a different transmitter, or it is connected through your Mode S and use the digital transmission features already in place?

Many who have fitted Mode-S transponders already have the equipment and electrical load to transmit position and velocity data to the collision avoidance system. If Flarm would just certify their GPS as TSO-C199 compliant, then many of us would already have the equipment required. This would seem to be the easy way to make the most people happy. If TABS requires yet another device, GPS receiver, and antenna, I will be reluctant to install it.