I'd appreciate it if anyone can help me with this question.

Which airplane(s) with the TDS GTNXi Virtual Cockpit integration have an autopilot with working VNAV functionality?

39 minutes ago, JJ_ said:

I'd appreciate it if anyone can help me with this question.

Which airplane(s) with the TDS GTNXi Virtual Cockpit integration have an autopilot with working VNAV functionality?

The Garmin GTN750xi does not have autopilot controlled VNAV except only when integrated with specific Garmin autopilots of which I know of none currently in MSFS.  What it does provide to ALL aircraft that leverage the 750 is a very accurate VNAV advisory system meaning the it will compute and keep track of all the needed items for an accurate VNAV descent including placing a TOD marker in the appropriate spot and give you a one minute aural warning prior to TOD arrival. At that point you simply use VS to descend at the appropriate FPM which will be displayed n your screen if you read the manual and set it up for VNAV type operations. The only thing different from a fully coupled VNAV like he G3000 or a PMDG Jet is YOU will command the time of descent and maintain the appropriate descent speed, NOT THE AP.  Make sense?

-B

While not the answer I was dreaming of, YES it makes total sense. Thanks @btacon for nice explanation!

While on the subject, is the lack of the TDS GTNXi  / AP VNAV (automated) integration due to the APs not being up to par on MSFS? For example, Working Title made significant GPS / AP VNAV automation progress, so I know it can be done.

The lack of full VNAV capability doesn't mean that the GPS unit won't drive an ILS/RNAV approach descent once you capture them. It (and the PMS50 one) will conduct those approaches.

1 hour ago, mmcmah said:

The lack of full VNAV capability doesn't mean that the GPS unit won't drive an ILS/RNAV approach descent once you capture them. It (and the PMS50 one) will conduct those approaches.

I think @btacon above is talking about something like a STAR descent or simply a descent from cruise altitude in order to hit a target altitude at a specified waypoint. He is not talking about a glide slope or glide path approach. An approach is not considered part of a typical VNAV system and as far as I know, the WT VNAV "ends" at the FAF of an approach.

Al

Edited March 3, 20242 yr by ark

1 hour ago, JJ_ said:

While on the subject, is the lack of the TDS GTNXi  / AP VNAV (automated) integration due to the APs not being up to par on MSFS?

I would not believe that to be the case. The GTN750xi can drive a full RNAV Descent with ALT and SPD restrictions. It will also drive a SID with ALT and SPD restrictions.  It has no troubles with all aspects of area navigation and approach, landing and departures.  No, from what I’ve read and been told, the 750GTNxi only talks its VNAV capabilities to GARMN only autopilots.  No exceptions. Full stop.  

Edit:  Perhaps I am misconstruing your question  What I want to assure you is the TDS 750GTNxi is fully capable in all aspects of vertical navigation, descent and ascent.  The only thing missing is “AP-initiated and AP-controlled” VNAV.  Instead you get pilot initiated and AP-controlled/Pilot-monitored VNAV.

-B

Edited March 3, 20242 yr by btacon