@artandtechnic Mode-C or altitude information isn't technically required, but it's required in so many scenarios that if you're near a city it probably is (class A, class B, class C, 10k or up, w/in 30nm of class B apt, tuesdays, new moons, etc). very weird how patchwork the rules have been in this area as the FAA fights between its desire to mandate mode-C and ADSB vs. the GA community that doesn't want to have to install transponders.
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