Quote Originally Posted by ahramin View Post

The idea of not turning your transponder on because few of us have aircraft equipped to see that transponder is misguided at best. There are plenty of fast aircraft flying in non-ADS-B rule airspace that are equipped to see you so it's not just a "shall" as pointed out above, it's also a good idea.
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No one advocated turning off mode A/C transponders especially since 91.215 specifically directs just the opposite.