Hi Sam, Felix,
just a few more comments...
> Agree 100% with Markus! The Big Boeing FMC User Guide is
> an absolute must! Use it for the PIC 767 and the PS1/PS1.3
> 747-400 from
www.aerowinx.com and it always
> amazes me how good these two sims are!
ah ... glad to see, that you have PS1.3 as well.

That's about the only simulator I use heavily and where all my knowledge comes from. You might be aware that I'm a frequent visitor to the Aerowinx forum and also an add-on programmer for PS1.3.
> didn't know about the more accurate FMC database, very interesting!
In fact, this information can be found in the Bulfer FMC Guide!

See the introductory paragraph on page 29 (Jan 1999 edition), "Identifiers".
I think the higher precision is common to ALL navdatabase on all FMCs and FMGCs! The reason is in my opinion obvious. I don't know PIC767 by heart, but you might be aware that PS1.3 has a
limited resolution coordinate system. All navaids and waypoints in the FMC can be programmed only accurate to 0.1'. If you have once programmed a final approach procedure, you might have noticed that waypoints with that accuracy are NOT located on the extended centerline of the runway.
For a real FMC box this is not acceptable and thus a higher precision (e.g. better than 1 meter = 0.001' ) is required.
@Felix:
> Und wenn nein, wie programmiert ihr dann Anflüge wie zum Beispiel
> Standardanflüge auf EDDL, EDLW, EDLP, EDDK, EHAM ein, bei denen
> z.B. von einem VOR von einem Flughafen weg geflogen wird bis zu
> einer bestimmten DME, und dann ein ca. 150° Turn auf den Final
> nötig ist? Oder diverse Missed Approaches?
Funny question... why should any of these approaches requires "Fly-Over" Waypoints? I don't see an obvious reason for that.
In fact, IF a waypoint needs to be coded as Fly-Over it will have a circle around the RNAV waypoint symbol (usually a star). A nice example for that can be found on the Jeppesen 18-1 chart for Munich which is the RNAV Rway 08L approach. While DM431 and MAGAT (FAF) are fly-by, the first RNAV waypoint in the go-around is DM551 - a fly-over waypoint.
Note that the Bulfer FMC Guide contains some tricks for manual programming to ensure that a waypoint is flown over and not by. This might be requested by ATC some day.
Markus