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Follow up to this, I found this section of the installation manual that seems to indicate that this is a configurable option: [2] seems to indicate that this is possible. However I'm a bit concerned about [1]. The two seem to contradict each other.

According to the avionics shop, they wired it up as shown in the first diagram in a prior message. But having flown with it in this configuration, it didn't show any traffic on the map so I don't think it was using the GPS heading info. I'm pretty sure it wasn't correlating the TAS data because...

So the 750 does need a heading source in order to use both TAS and ADSB?

Update. The avionics shop says that, in order to show the traffic correlated on the GTN 750, it requires a heading source: They say: "Currently, the GTN 750 does not have any heading connection, so it cannot present information on both types of traffic. However, the aircraft has a KI-525A...

Thank you. That's very helpful. I'll let you know how it goes...

Thank you for this. If you don't mind my asking, where did this come from? I'm going to present this to my avionics guy. Now that I see this, I realize what he did was leave the KTA870 wiring connected to the GTN750 where it had been before. He needed to move it to the GTX345. Either being...

Thanks for this. The avionics tech says the 870 only has “analog” output. When you say wired to the 345, do you mean ARINC digital data?

I just met with the Garmin dealer. Apparently they didn’t take into consideration the existing TAS system in my Cessna 182T which came from the factory. They have serviced this plane for over a decade and were well aware of its configuration. When they did the GTX 345 install they must have...

I wonder if the X over the two icons here and here might indicate something amiss?

This one is a bit more informative because you can see a thunderstorm strike between MPMG and MPTO. Without a heading source, it wouldn't show this.

Thanks for this. I do have the "traffic" button enabled. Am I missing something else? FYI this is what it looks like, you can see the traffic on the 650 below but not on the map of the 750.

Hi, I have the following avionics: - Garmin GTN 750 - Garmin GTN 650 - Garmin GTX 345 ADSB in/out - Honeywell KTA 870 TAS - WX 500 stormscope - Flight Stream 210 - KAP 140 + KI 525A - iPad with Garmin Pilot, Bluetooth interfaced to FS210 + GTN345 I just had the GTX 345 installed. Before I...

I've spoken to them on the phone and they're actually very nice and helpful. I don't think they've "given up" but for sure they seem to have pricing that is more geared to commercial operators than private pilots. I'm working with one of their technical support people right now and he's taken...

OK, I've spent some time on the issue and have been given some bad news by my avionics guy: apparently the TAS (traffic) function of the system is providing bad heading data to the KMD 550. As I understand it, this system is somewhat strange in its design: there are multiple sources of heading...

Good idea, and I know exactly when I'm going to do the turns. I have a sightseeing trip this weekend which gives a good opportunity to circle around a point on the ground. Thanks for the tip.

I just spoke to my avionics technician. The problem was apparently a poor connection between the HSI and the MFD, which he has fixed. He's finalizing some configuration changes with his laptop and then I'm going to test fly it tomorrow. If I see any issues, I'm going to try the 720 degree turns...

I posted a reply but for some reason it is being held up by a moderator. Yes, the plane has a HSI and I have spoken to my avionics technician and he thinks that the heading information from the HSI is not being correctly passed to the MFD, resulting in a couple of faults including TAS issues...

Thanks for the reply... I'm looking at those pages in the PDF but there seem to be no figures (images) on them. What option do you select to change the orientation of the little plane icon? *** edit *** Just tried the PDF on a PC, for some reason many of the images don't display on Mac's...

Hi everyone, I'm a 250 hr PP-ASELS with 14 hours experience with my 2001 Cessna 182T. It's a fantastic airplane but I find the King KMD 550 MFD and its associated KLN 94 GPS quite antiquated. Pretty much all my experience with aviation GPS is with Garmin - I have a Garmin 695 in another...