GDL39 Firmware 4.30

[petehowell]

Saturday (2/28) I loaded firmware 4.30 from the Nexus 7 to the GDL39 - no problems. This update installed the "ADS-B Compliance Tool".

Matt Burch was kind enough to reply to my email (on a weekend!) that:

This is something that you can use with the latest version of the Garmin Pilot iPad app to view the details of the ADS-B output of nearby transponders.

I broke out my wife's Ipad with the latest Garmin Pilot on it and could not see how this feature worked and did not find any documentation on the web.

Has anyone else seen this or figured out how to use it?

Thanks for any help!

[g3xpert]

Originally Posted by petehowell

Saturday (2/28) I loaded firmware 4.30 from the Nexus 7 to the GDL39 - no problems. This update installed the "ADS-B Compliance Tool".

I broke out my wife's Ipad with the latest Garmin Pilot on it and could not see how this feature worked and did not find any documentation on the web.

Thanks for any help!

Hello Pete,

What version of Garmin Pilot are you using on your iPad? It is our understanding that the 7.20 version of Garmin Pilot which provides the ADS-B Out compliance tool doesn't come out until tomorrow.

Thanks,
Steve

[petehowell]

That would be it. I have 7.1.1. I will check back after I upgrade to 7.2!

Thanks Steve.

[g3xpert]

Hello Pete,

After you upgrade to Garmin Pilot for iOS V7.2, just select the GDL 39 on the Connext page, and touch the ADS-B Compliance line.

Next, it will show you a list of ADS-B Out aircraft that are being monitored (including your aircraft). Select an aircraft to see the status of all those 91.227 parameters that are being transmitted like NACP, NACV, NIC, SDA, and SIL.

Parameters that are shown in green are within compliance limits, and those shown in red are not.

The primary purpose of the tool is to allow you to check the output of your aircraft and determine if your ADS-B Out is compliant or if changes are needed.

FAR 91.227 requires the following information be transmitted, and the status of all of these parameters, and more, are provided by the tool and displayed on your iOS version of Garmin Pilot when using a GDL 39/39R.

(c) ADS-B Out Performance Requirements for NACP, NACV, NIC, SDA, and SIL--
(1) For aircraft broadcasting ADS-B Out as required under Sec. 91.225 (a) and (b)--
(i) The aircraft's NACP must be less than 0.05 nautical miles;
(ii) The aircraft's NACV must be less than 10 meters per second;
(iii) The aircraft's NIC must be less than 0.2 nautical miles;
(iv) The aircraft's SDA must be 2; and
(v) The aircraft's SIL must be 3.

For your G3X system with a GTX23ES transponder, the SDA setting is directly controlled by the GPS Integrity field on the Transponder configuration page.

When using the VFR WAAS GPS position source built into the G3X display, this field is set to "VFR" and the transmitted SDA will be 0. When a GNS 4XXW/5XXW or GTN 6XX/7XX navigator is connected to the GTX23ES, this field is set to "1E-7" and the transmitted SDA will be 2.

The NACP, NACV, NIC, and SIL parameters are not user selected, and will be correct (compliant) and shown in green when the GNS/GTN is properly installed and configured for ADS-B Out+.

Thanks,
Steve

[jgoehl]

Steve:

Will this show the status of our output , or only other adb-s out planes ?

[g3xpert]

Originally Posted by jgoehl

Steve:

Will this show the status of our output , or only other adb-s out planes ?

Hello JGoehl,

Good question. Yes, your aircraft should show up in the list of monitored aircraft and you may choose it to display the ADS-B Out data.

I updated my posting above to make this clear.

Thanks,
Steve

[jgoehl]

That is excellent,, will be a great asset.

The Garmin pilot app just keeps getting better and better.

Thanks,
Jeff

[Krynn]

Originally Posted by jgoehl

The Garmin pilot app just keeps getting better and better.

It's getting better... but those of us with Android devices are still left missing a lot of the neat features the Apple types get.

[petehowell]

Played with this on the ramp a bit this evening. Good stuff!

My plane and all the others I saw above me all had some red elements. What is the criteria used by the GDL/Pilot App to determine if a target is compliant and is going be displayed or rejected and not displayed?

[g3xpert]

Originally Posted by petehowell

Played with this on the ramp a bit this evening. Good stuff!

My plane and all the others I saw above me all had some red elements. What is the criteria used by the GDL/Pilot App to determine if a target is compliant and is going be displayed or rejected and not displayed?

Hello Pete,

If you touch one of those red fields, it will bring up a page which shows the present value, the required value (for compliance), and even the regulatory reference for that parameter.

You shared your position source/transponder setup with us, and it will be normal for you to be seeing red.

Thanks,
Steve