The RMI combines a number of useful displays.

The Aircraft Logo The small aircraft log at the centre of the instrument face does not move or rotate, and represents (as with the HSI) on the face of the instrument the aircraft's orientation

Compass Card is slaved to the remote gyro, and should give the same heading indication as the compass card in the HSI - and both should align with the E2B magnetic compass within a degree or two. Check this Pre-Flight.

ADF Indication The Green coloured needle (head) will indicate the QDM to any NDB beacon whose signal being received by the ADF. When testing, and the ADF button is not pushed in, the Green Needle should indicate towards the 3 o'clock position (or if you prefer, the "90 degrees to starboard mark").

Use the Head of the needle for tracking to the NDB and the tail to track away from it. It is sometimes helpful to remember, that when intercepting and tracking to and from an NDB, using the RMI, that changes of heading are best effected by remembering the following simple rules.

"When tracking TO an NDB, change heading to the side of the Needle HEAD such that you can "PUSH" the head towards the required QDM."

"When tracking FROM an NDB, change heading to the side of the Needle TAIL such that you can "PULL" the tail towards the required QDM."

If in doubt remember you can PULL the dog's TAIL with impunity but it would be unwise to pull his head! (Courtesy - Mike Smart)

For example, if in the view shown above, the ADF (green) needle was actually pointing to the current heading(112) and the aircraft was tracking the 112 radial, and the desired NDB inbound radial was 090, it would be necessary to change heading to the right - Why? - because the right hand side of the needle is the side of the needle head that you would need to be on to "push" the needle onto the figure 090 (or "E"). This change of heading would have the effect of making the needle fall towards the E, and when it was pointing at the E, or shortly before that time, a turn onto the 090 radial would be effected.

If, in contrast, the tail of the ADF needle was pointing to 112, (ie you were tracking outbound from the NDB on the 112 radial) and you wished to track outbound on the 090 radial, you would need to turn to the left - because the left hand side of the tail of the needle is the side you would need to be on to pull the tail onto he 090 figure. Having effected such a change of heading, the tail will fall towards the 090 mark and shortly before it lies on it, turn onto the 090 radial.

VOR Indication The yellow needle will provide a QDM to any VOR which is being received. Either NAV1 or NAV2 may be selected by switching between NAV1 and NAV2 with the small silver coloured toggle switch mounted on the control panel and so marked.

Tracking a VOR may be effected in the same way as above (though with the HSI, it hardly seems worthwhile trying) but on seeking to intercept a radial, it does provide confirmation of the correct direction in which to turn since the same simple rules as above apply.

It is probably more useful in ascertaining when a particular radial from a station set on NAV2 has been encountered - for example by noting the QDM at which the edge of controlled airspace will be encountered when approaching an airway and tracking outbound on another Radial set on NAV1.