the 172s in the
club I blelong to don't have DMEs.
Is that required for IFR flight?


Nope. If you are not using those checkpints or doing DME-required approaches,
you don't need DME. Many intersections are also identified by dual VORs, but
you don't (legally) even need two VORs (except for certain approaches - the
requirement is on the plate), you just tune one, then tune the other, to check
your position.

Jose



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