Garmin G5 Help

[willscott561]

Hello,

I've searched across large swathes of the internet but I can't seem to find the same set of circumstances that pertains to me. I have dual G5s paired with a GNX375 GPS. When I select an ILS procedure on the GPS, the LOC is displayed on the G5 HSI, but no GS. I also tune and ident the ILS frequency but I suspect that is not linked to the glass instruments. I have an old steam gauge HSI that correctly displays LOC and GS so it's not a huge deal that the GS is not displayed on the G5, but I can't work out why is isn't. The plane is a lease so I'm sure I could find out from the owners, but I wondered if anybody had any suggestions before I go down that route. Apologies if this has been answered before. Thanks in advance!

[Andy95W]

Everything is working normally.  The GNX-375 doesn’t have an ILS receiver, so when you load the ILS, you’re loading a GPS overlay approach that is intended for monitoring only.  To fly a precision approach to that runway, you’re expected to fly the LPV approach (which usually has the same minimums anyway).

The GPS could probably load a GS solution based upon WAAS, but either for legal or liability reasons it won’t.

[willscott561]

Hi Andy,

Thanks for clearing that up. So what would I need to select on the GNX to get a GS displayed on the G5? A different procedure?

[Andy95W]

Yes, you would select a different procedure.  Instead of, for example, selecting the ILS 13, select the RNAV 13 (see screenshot, below).  On that page, the RNAV approach specifies that it is the GPS LPV approach, which will give you a WAAS/GPS glide slope.  The minimums for LPV approaches are normally the same as the ILS minimums for the same runway.

[Marauder]

49 minutes ago, Andy95W said:

Yes, you would select a different procedure.  Instead of, for example, selecting the ILS 13, select the RNAV 13 (see screenshot, below).  On that page, the RNAV approach specifies that it is the GPS LPV approach, which will give you a WAAS/GPS glide slope.  The minimums for LPV approaches are normally the same as the ILS minimums for the same runway.

It is interesting they provide an overlay for the ILS approach. I wonder how many pilots will mistaken it for a full ILS approach.

[Ragsf15e]

9 hours ago, Marauder said:

It is interesting they provide an overlay for the ILS approach. I wonder how many pilots will mistaken it for a full ILS approach.

Definitely something to watch, but I’m glad they do.  If I go that route when my 430W dies, my ILS will be on nav 2 with an old obs.  The overlay will be quite helpful and allows autopilot to fly up until the faf.

[carusoam]

Welcome aboard Will!

Sounds like a lot of reading to do...

The Old ILS was so simple in comparison...   

Got a pic of your panel?

Best regards,

-a-

[willscott561]

16 hours ago, Marauder said:

It is interesting they provide an overlay for the ILS approach. I wonder how many pilots will mistaken it for a full ILS approach.

There's one over here certainly at least!

7 hours ago, carusoam said:

Welcome aboard Will!

Sounds like a lot of reading to do...

The Old ILS was so simple in comparison...   

Got a pic of your panel?

Best regards,

-a-

Absolutley! Here I was flying with (semi) glass for the first time and thinking it would all be the same.

 

17 hours ago, Andy95W said:

Yes, you would select a different procedure.  Instead of, for example, selecting the ILS 13, select the RNAV 13 (see screenshot, below).  On that page, the RNAV approach specifies that it is the GPS LPV approach, which will give you a WAAS/GPS glide slope.  The minimums for LPV approaches are normally the same as the ILS minimums for the same runway.

This has certainly saved me sending my head through a wall. Thank you so much for the help!

[David Lloyd]

When you select the ILS approach on the GNX375, you will get a message the ILS is for practice only, not to be used in IFR.  Or something to that effect. The message has to be acknowledged before continuing. Sometimes I get the glideslope, sometimes I don't.  I think it has to do with how the approach must be used: Intercept the localizer two miles or more outside the IAF and the glideslope from below.  No short cuts.  When the glideslope doesn't work for me, it is usually because I flew directly to the fix as opposed to intercepting a couple miles out.  Try it on the Garmin simulator and you will get your answer.

Took my own advice and checked it out on the Garmin Aviation Trainer, a terrific way to learn and understand your GPS.  I could not get the GS to show on the G500 when doing the ILS with the GNX375.  Now I'm really wondering what is up. I'll just have to stand with what I said 9 hours ago, sometimes I get the glideslope, sometimes I don't.  Eventually I will figure out why is is a sometime thing.

[81X]

The GNX375 does not have VHF nav or com capabilities and therefore can’t tune an ILS.  The 375 is just providing lateral guidance for cross-check reference only. 
 

since the 375 is a WAAS GPS, it is certified for, and will give you the GS for LPV approaches.  
 

To add confusion, on my 750, if I select an ILS approach on the unit, it is using GPS to draw the magenta line and show where I am in relation to that line. I need to tune the ILS using the VHF nav and tell my 750 to output the Nav CDI information to my G5 HSI instead of GPS. 

[AerostarDriver]

As stated above, the GNX375 does not have a VHF NAV radio. However, consider the following:

• Check your G5 when you load the approach, do you have pink needles or green needles?
• Have you tuned your external nav radio?
• Is your nav radio compatible and connected to the GAD 29B?

[hammdo]

Which is why mine is setup with independent systems:

 

kx155 with old school indicator,

gnc355 on g5 HSI

g5 AI coming soon...

-Don

 

[Warren]

On 5/16/2021 at 4:07 AM, 81X said:

The GNX375 does not have VHF nav or com capabilities and therefore can’t tune an ILS.  The 375 is just providing lateral guidance for cross-check reference only. 
 

since the 375 is a WAAS GPS, it is certified for, and will give you the GS for LPV approaches.  
 

To add confusion, on my 750, if I select an ILS approach on the unit, it is using GPS to draw the magenta line and show where I am in relation to that line. I need to tune the ILS using the VHF nav and tell my 750 to output the Nav CDI information to my G5 HSI instead of GPS. 

@81XOn the 750, you can configure it to load the ILS frequency automatically (it loads it to the backup NAV frequency and you need to manually switch it to active).  You can also configure it to automatically switch to VLOC as you intercept the procedure (I forget exactly where but it usually happens ~ a few miles outside the FAF)