Hi-need a little help troubleshooting:

First, I see the GPSS mode dataref is correct but it’s not staying on GPS course when selecting VLOC. 

Second, the CDI for 430 #2 is the previous flight plan from the underlying xplane430, not the RXP 430. 

Hi,

I need more explanations! I don't understand at all what you are referring to?!!?

Do you mind explaining in more details, eventually with screenshots?

Sorry, yeah while that all made sense to me it was pretty light on details 😄
Garmin 430W v2:
#1: While in GPSS AP mode, if you switch CDI from GPS to VLOC (using button on Garmin), the AP stops following the GPS course, and follows what seems to be a 360 heading every time. (GPSS mode should ignore CDI mode and take course direct from the GPS)

#2: on the PFD, it is displaying an old, sort of phantom waypoint and course from the xplane 430 (prior to enabling the RXP ones), its not taking an update from the RXP #2 Nav- you can see it in the PFD display, as well as the course it tracks. The old waypoint and course never changes, just remains the old one no matter what i enter on the RXP NAV2.  I don't see this for NAV1, just NAV2.

I can't seem to be able to upload screen shots, but have a couple. Thanks.

6 hours ago, Nmcjr said:

Sorry, yeah while that all made sense to me it was pretty light on details 😄
Garmin 430W v2:
#1: While in GPSS AP mode, if you switch CDI from GPS to VLOC (using button on Garmin), the AP stops following the GPS course, and follows what seems to be a 360 heading every time. (GPSS mode should ignore CDI mode and take course direct from the GPS)

 

That is how it expected to work!

GPSS mode is only for GPS mode, when switched to VLOC there is no GPS guidance signal coming from the 430W, only VOR/LOC(/GS) signals are available externally, so you can only use NAV or APR modes of the AP, and GPSS just does not make any sense, as when flying with the AP on GPS signals, it is just required that should be reflected on the CDI as well.

On screen the GPS still gives its GPS nav info when in VLOC mode, but coupling to AP and CDI/VDI is from the VHF receiver only, not from GPS navigation. In that case GPS nav is secondary fro information only.

 

Your #2 description is still unclear to me. Which PFD, which aircraft? A CDI on the PFD?

Edited March 21, 20215 yr by PeterBremer

5 hours ago, PeterBremer said:

That is how it expected to work!

GPSS mode is only for GPS mode, when switched to VLOC there is no GPS guidance signal coming from the 430W, only VOR/LOC(/GS) signals are available externally, so you can only use NAV or APR modes of the AP, and GPSS just does not make any sense, as when flying with the AP on GPS signals, it is just required that should be reflected on the CDI as well.

On screen the GPS still gives its GPS nav info when in VLOC mode, but coupling to AP and CDI/VDI is from the VHF receiver only, not from GPS navigation. In that case GPS nav is secondary fro information only.

 

Your #2 description is still unclear to me. Which PFD, which aircraft? A CDI on the PFD?

#1- it definitely shouldn’t work that way. With GPSS it is a direct connection from the 430 to the AP. AP does not take the input from the CDI, so CDI source is irrelevant. I own and operate these units in real life, and this is also how the X-Plane 430’s behave. In fact you can pull the PFD breaker and it will continue just fine. The reason this is important is I can enter GPSS mode and then flip to VLOC and get ILS tuned and course set and then flip to NAV mode and intercept via the CDI. https://developer.x-plane.com/article/track-to-intercept-making-sense-of-lnav-and-locapp-modes-in-11-10/

For #2, if you can set me up to post screen shot will be easier but I’ll try to describe : with the xp430 I flew direct to O61. Then I installed RXP and on NAV2 I entered direct to KMHR. The NAV 2 waypoint on PFD still shows O61, and the CDI deflection is for O61 not KMHR. So, RXP NAV 2 is not overriding the xp430 

Also, this is from STEC55x POH:

“With the autopilot in the GPSS Mode, NAV and GPSS will be annunciated. In this mode, guidance is received directly from the GPS Navigator regardless of what is displayed on the NAV indicators (HSI, CDI...). If the GPS Navigator has a valid flight plan active and the autopilot is in the GPSS Mode, the autopilot will follow that flight plan.”

48 minutes ago, Nmcjr said:

Also, this is from STEC55x POH:

“With the autopilot in the GPSS Mode, NAV and GPSS will be annunciated. In this mode, guidance is received directly from the GPS Navigator regardless of what is displayed on the NAV indicators (HSI, CDI...). If the GPS Navigator has a valid flight plan active and the autopilot is in the GPSS Mode, the autopilot will follow that flight plan.”

That text can not be found in: https://genesys-aerosystems.com/sites/default/files/files/System Fifty Five X_ pdf(1).pdf

Perhaps the 55X behaves diferently than a system 60-2 with GPSS extenion, because that one works via HSI.

That’s correct whereas AP’s with integrated GPSS like 55x and DFC90 get the signal direct from the 430, allowing you to tune and flip to VLOC and set course while flying the PT or to the IAF on GPSS 

19 hours ago, Nmcjr said:

So, RXP NAV 2 is not overriding the xp430 

Hi,

First, thank you for all the feedback!

What do you mean with RXP NAV 2??

- Do you mean a RXP GPS #2 unit? Or a RXP GPS configured to connect to COM2/NAV2?

- Is the "RXP NAV 2" GPS you're referring to setup to pilot or copilot side?

Please also note any #2 RXP GPS is overriding the X-Plane #2 GPS (meaning the gps2 datarefs). If the aircraft configuration (plane maker?), or internal XP11 code, is only coupling #1 GPS to the autopilot, there is nothing we can do to make a #2 GPS overriding this logic. This might be the reason you do get "phantom" wpts still displaying, because XP11 is freezing any update to its internal GPS whenever a plugin uses "override_gps". Furthermore, when using the "override_gps" dataref, there is no possibility to selectively override gps#1 but not gps#2. It is all or nothing, therefore it is better using 2 RXP GPS instead of 1 RXP and 1 default.

Besides, since you're using a PFD with route display, you might want to also enable the following RXP GPS setting "Auto-Update Simulator GPS Waypoints" so that the active route waypoints are also updating into the internal XP11 FMS route.

NB: XP11 only offers a crude interface to plugins consisting only in direct legs route between waypoints. Furthermore, XP11 SDK doesn't allow plugins setting wpts with their own names, therefore some of these might show up as a string of LAT/LON values instead.

As for GPSS

The actual RXP GPS autopilot coupling code is only overriding the flight director when:

- RXP GPS is in GPS mode
- XP11 HSI source selector is GPS
- XP11 autopilot source side is matching RXP GPS side ("sim/cockpit2/autopilot/autopilot_source" - pilot/copilot)

If all these conditions are valid, the RXP GPS is overriding HNAV coupling only if a valid XP11 HNAV mode or GPSS mode, are engaged.

 

So if I understand you correctly, there are some autopilot systems with GPSS which are coupling with the GPS only if the GPS is in GPS mode, and there are other autopilot systems with GPSS which are coupling with the GPS regardless the GPS GPS/VLOC mode? In this case, do you mean you can fly with the HSI sourcing its data from VLOC sources, with the GPS set to VLOC mode, but the autopilot is following the GPS course instead? Isn't this confusing?!?!

 

Edited March 22, 20215 yr by RXP

1 hour ago, RXP said:

In this case, do you mean you can fly with the HSI sourcing its data from VLOC sources, with the GPS set to VLOC mode, but the autopilot is following the GPS course instead? Isn't this confusing?!?!

 

If a AP would have that capability I would NEVER use it. For me the CDI should always show the effective navigation. Meaning that for any procedure for which GPS is advisory for a certain part of the procedure, GPS with GPSS can be used till the offical approved procedure needs VLOC, in most cases that is at/after the IF and well before 2 NM before the FAF, Then you just switch to VLOC and at the same time to normal NAV/APR mode of the AP, you never maintain the GPSS of the AP seperately. Reading the 55X manual that is also how it is intended to be used.

During GPS/GPSS navigation you can still prepare the full setup of the NAV radio's and execute the ID of the station(s), that is independent from GPS or VLOC mode. Normally you have your full setup, including initial missed approach setup ready before the IAF.

The STEC55x can’t fly a procedure turn unless in GPSS mode. In a Cirrus Entegra you can’t set ILS course unless you are in VLOC . So, yes there are times when not on vectors that you’d want to be able to do both, but even more importantly it’s how it works in RW, so to me it’s important to simulate it so as to not cover up mistakes, and/or train with lazy button pushing. 
 

As to point #1. What I’m referring to is RXP Unit 2, set up to pilot side and I do have “auto update simulator gps” option set but it just won’t send updated waypoints or CDI information for #2- it’s just stuck on a waypoint from days ago. 
 

#1 seems to need to cycle the AP from HDG to NAV and back to HDG to pick up the waypoints. Does that give you a hint since there’s no AP for #2?

@Nmcjr Just to make sure: did you set the unit #2 as the "Master Device"?

And more importantly (I can't find it in the discussion), what aircraft are you using?

I only had #1 as master. I’ll try #2 also as master, I’m not sure if that’s what you’re suggesting. 
its the same for a couple I’ve tested, so as one example Jason Chandler SR22. 

17 hours ago, Nmcjr said:

The STEC55x can’t fly a procedure turn unless in GPSS mode. In a Cirrus Entegra you can’t set ILS course unless you are in VLOC . So, yes there are times when not on vectors that you’d want to be able to do both, but even more importantly it’s how it works in RW, so to me it’s important to simulate it so as to not cover up mistakes, and/or train with lazy button pushing. 
 

 

RW: Why would you like to set up ILS course on your primary navigation instrument before you are using it?
Your primary navigation instrument's course should always match to the current course to fly for situational awareness and backup reasons, also in the procedure turn. Idem for the heading bug, even if you are not using the heading bug at that moment.

As soon as you are coming to the point where you like to switch from GPS (and GPSS) to VLOC (and NAV/APR) your course finally set during GPS/GPSS navigation is or is very close to the requiried ILS course if you updated that course continiously as you should have done for situational awareness and backup reasons. One of the resons the course set on the primary navigation instrument should always match the current course to be flown is that you should all the time be able to immediately take over the AP manually without changing anything in your navigation setup.

Edited March 23, 20215 yr by PeterBremer

It’s not like a traditional CDI. It’s a discreet instrument when you set the VLOC on PFD. So, you switch momentarily to get set up in advance then switch back, you aren’t changing the primary instrument. That’s one example where modeling the proper GPSS behavior makes sense , but mostly because practice makes permanent not perfect and I think those buying RXP are doing it for increased realism and if using for training I think it should work as it does in RW.