I’m having the same issue. I have not found a solution. Opened a ticket with JF, but they’re stumped. Have you gotten it to work…530 mod or not?
Have you tried to turn the knob on the left with the „.C“ on it?
Yep. The units turn on…I can see the buttons illuminated and the nav instruments come to life, so I know it’s “on”
The button illumination and the nav instruments are controlled by different knobs and switches. You can turn on the illumination without turning on the GNS. There is a button on the device itself to turn it on.
On the nav page 2 pressing menu i can turn weather radar on/off. Is there suppose to be an indicator somewhere that shows when it’s on or off?
No indicator. I adding that to the to-do list.
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V 1.0.34
I’ve seen this quite a few times, but never sat down to replicate exactly. It may be another one of those core Asobo issues, but here goes:
Start with no flight plan, then add in a direct to a nearby airport. It should look like this:
Now scroll down to the row immediately below that destination, and add in a new waypoint. I chose FYMM.
It ends up inverting the flight plan for some reason.
After inverting it to what I wanted, subsequent waypoints added work as I expect.
It’s better to always set an origin and possibly a destination in this sim.
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True, I’m just using the functionality as provided. When I land I will retry without the mod. Let me try inserting the departure inbetween USER, and FYMM…same thing as before. Instead of:
USER
FYMM
FYWE
Or perhaps as I would really want:
FYMM
FYWE
You get the inverted plan again.
So I tried mixing the two. Add a departure, then plot a direct to, then append the next waypoint i.e FYMM, FYWE, FYWH:
Now add the next waypoint, FYWH:
It still inverted it, but it left the first waypoint intact. It effectively replaced USER, instead of adding FYWH as the last waypoint.
Guys, anyone who can do RNAV with the GNS530 mod? Glidepath is captured but always come early (4 red papi lights). I just wanted to make sure I am not doing it incorrectly here in MSFS. Out of curiosity, I tried same approach in X-Plane today, and all was good. Please excuse the graphics 
I confirm this. I manually entered airport of origin, then followed by destination airport at the bottom. Upon pressing enter, the two airport entries was inverted. I inverted it in the menu, and proceeded normally entering other waypoints. I can get the details later.
GNS530 does not do vertical guidance in MSFS (great mod though) as far as I understand it. You need a GNS530W to be able to output to your ILS gauge. It’s a bit of a Gotcha because you could deceive yourself into doing a perfect approach with the glide slope staying rock steady in the centre (where you want it to be). Your screenshot annunciates VNAV confirming you have vertical guidance. The W stands for WAAS capability.
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The GNS530 in the sim will do vertical guidance and the autopilot in approach mode will follow the glidepath. It must be an LPV approach and, unless they’ve fixed the bug, there can’t be a waypoint between the final approach fix and the runway.
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it can takes months or years ! (and creating new one fixing it)
Thank you, that GNS530W - that “W” is additional to my knowledge, appreciated 
Thank you. Been reading in the last few days on the RNAV LPV approach, and so far I have the picture of the situation now here in MSFS 2020.
With the release this month of the PMDG DC-6, would it be possible to get VNAV on the GNS430?
That would be really cool
You mean the VNAV calculator for your TOD as in the GNS530?
Absolutely, i saw a couple of picture where the VNAV menu was on the last page of the NAV segment on the gns430. Not sure if it’s available in real life or if it’s just a X-Plane feature.
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Yes it exists in the RW unit. I added that to the todo list.
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