Bit of a drift, but Australia used to have a DME only approach ie no azimuth aid, called a 'DME Descent'. You were required to be able to home to the DME to get within 2 DME, time an outbound heading to an 80/260 procedure turn then home back to the aid, arriving again within 2 DME.
Not so difficult to bracket & home with more modern DME receivers but there were receivers for the unique, Oz developed domestic DME system that didn't have a rate of closure function. Instead you would have to time a mile or two to find ROC, adjust, re-time, adjust & re-time
A lot of places only had a single NDB or VOR, plus DME so a published DME Descent was useful to meet Oz' IFR charter requirement to have two approaches at the destination OR carry an alternate. Alternates within reasonable range (or even within range at all) weren't always available.