For those shopping for a traffic system upgrade, the selection has never been more complicated. Judging by the frequent calls and letters we get from confused buyers, it’s ADS-B that’s creating the confusion. The buying decision might be easier once you understand the theory behind ADS-B traffic and in particular, its limitations. You’ll also need to assess your flying mission and decide if the growing ADS-B system suits your mission better than active traffic alerting, known as TAS.

In this report, we’ll compare these different traffic technologies and offer hints on how you might qualify a buy-in right now.