Get pilots talking about ADS-B and they start griping about money. Forget the soon-to-be required ADS-B out systems; just getting free ADS-B weather and traffic costs between $500 and $1100. If you want it to work with ForeFlight Mobile, the most popular aviation app by far, you are limited to only one brand of receiver—Appareo’s Stratus.
Portable ADS-B In isn’t that complicated. It requires a 978 MHz receiver for weather and some traffic, a simple computer that converts those signals to a common protocol and transmits the results via Wi-Fi. You can pump up system performance with a second 1090 MHz traffic receiver, GPS position and AHRS.