Chapter 5.1 (Suggested Uses) has at least some vague suggestions:
> Some uses for the LOC RR have already been suggested, including the
> USENET backbone flow maps, a "visual traceroute" application showing
> the geographical path of an IP packet, and network management
> applications that could use LOC RRs to generate a map of hosts and
> routers being managed.
There's no reason this couldn't be a human-readable string like "42 Wallaby Way, Sidney".