Just did my CAANZ IFR renewal (jet/Multi crew) and the form said for Mandatory items: "GNSS and VOR
OR NDB approach competency..."
Australia I think is catching up as an NDB was required a year ago but can not confirm this now.
For smaller types and regionals it would be advisable (& great practice) to be endorsed but for heavier jet types the NDB is becoming more and more irrelevant as GPS & IRS navigation reliability can get you down to a bee's d#*k.
Happy Landings
