Does an RMI show true or magnetic north?
In a typical installation, the compass card of an RMI indicates magnetic north. 

While it is possible to switch that reference on an EFIS display to true north by applying the local variation, that is not the common practice. If you see a "steam gauge" RMI (i.e. not a digital display, but a mechanical compass card) in a panel, chances are excellent that the compass card is slaved to the same heading source as everything else -- magnetic north. In the exception cases, that source can be switched between true &amp; magnetic, but that's uncommon.