Originally Posted by
belongamick
Cairns 15 has a MM
Not sure if there were ever IM in Australia
From a very old
CASA document on ILS marker beacons,
...
Some overseas installations utilise a third marker beacon (inner marker) which is modulated at 3000-hertz, identified by a keyed continuous signal of six dots per second and is located 75–450 metres from the runway threshold. There are no inner markers associated with ILS installations in Australia.