SoCal App, yes, that 1 nm per 1000ft is a very good US rule of thumb
which few here have ever been taught. I was told it by a USAF exchange officer and taught it ever since!
MSP - also remember that a DME frequency-paired with an ILS will be adjusted to show range to the threshold, not to the beacon. If not, then the fact should be promulgated.
Except in the Brize Norton approach plates..... The Brize ILS is on 111.9 and the DME comes from a TACAN which co-incidentally is on the frequency assoicated with 111.9. Range will be shown to the TACAN,
not to the threshold, so beware!