I like heliboard. The swipe feature does require a proprietary blob, and it’s not perfect, but it works decently well and they stent collecting my data.

While there are huge issues in ATC and military aviation, 5 miles is pretty damn far apart for planes not on a collision course. The (IFR) standard is 3 miles of separation within 40 miles of the radar site and 5 miles separation beyond that. So that could be within standard separation.