Agree with the rest...just this to add in case you don't want to look it up.
Left Instrument: As said, Dual Needle RMI. Acts like your Heading Indicator but with needles showing bearing to selected station added. Whether the needle shows the bearing to a VOR/TACAN or a NDB depends on the selection of the "kill switch(es)". Those are the two tiny buttons with the double headed arrows on them. In the screen above, both the single and double needle icons above the kill switches are pointing down towards "NAV" indicating that they are showing the bearing to VOR/TACANs. If the icon(s) were pointing up, they would be showing bearing to NDBs.
Many (I'd say most) airplanes today only carry a single ADF receiver, if even that. It's convention that a single ADF will use the number one (single) needle which is why ADF/NDB and the number one needle are generally synonymous. The easy way to tell is that often the kill switch that can't display ADF will have a little "INOP" placard stuck over the ADF.
Another thing that is important to know about the RMI is that, not only does it tell you what the bearing to the station is but, often more importantly, it tells you where YOU are in relation to the station. On an RMI, you always sit on the tail of the needle. so, in the above example, you are sitting on the 025 degree radial of whatever is dialed in NAV 1 and the 360 degree radial of whatever is dialed in NAV 2. So, no nasty TO/FROM flags; just look at the tail of the needle!
Lastly, since the needles are always pointing to "something", they generally park at 3 o'clock if they are "off". Since this is your greatest rate change position, if you are going straight for any length of time and the needle hasn't moved at all, you can probably assume that the needle is pointing to nothing. I seem to recall that pure TACANs made the needle spin when off, but don't quote me on that.
Right Instrument: HSI. This is nicer than the fixed Cessna needles in that it rotates thus giving you a better view of your intercept geometry. The single CDI needle is controlled by the left, arrow knob. The right knob can be used, as said, with the autopilot.
In real life, you would use the right knob also to mark your desired/assigned heading. In the sim though, it's kind of a pain in the behind to mouse over that thing just to keep track of your 5 degree crab on the ILS.
Dont know if that helps any.
Deacon
BTW, that book that Paul pointed out is full of interesting info. If you have time to read it, it will really improve your sim instrument flying quite a bit.
