Bearing Pointers On G5 Or Gi 275 - Avionics/Panel Discussion

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• Bearing pointers on G5 or Gi 275

Bearing pointers on G5 or Gi 275

By NicoN July 12, 2021 in Avionics/Panel Discussion

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NicoN

Posted July 12, 2021

NicoN

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• Location: Wiesbaden, Germany
• Model: M20K from 1980, EDM830, GNS430W; Century 21

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Posted July 12, 2021

Hi Mooniacs,

we have the chance to buy a used GNS430W.

We already have a GNS430W hooked to a GI 206 and a KX155, hooked to a KI something CDI with GS. AFAIK, this DIsplay is not so easy to connect to a GNS430W as the GI 206 is.

So, the idea is to go the expensive way and remove the DG, add a G5 or GI 275 and replace ADF and KX155 with a GNS430W

 

I am not sure, if a G5 or GI 275 can show a second  NAV-Source as a bearing pointer. With this feature, a GNS430W can easily replace a ADF.

AFAIK, at least an Aspen can do exactly this. Show ONE Navsource (GPS or NAV) as HSI and 2 more as bearing pointers.

Can a G5 do the same? And Gi 275?

Of course, I would prefer a GI 275 (or 2 :-)

 

 

 

David Lloyd

Posted July 12, 2021

David Lloyd

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Posted July 12, 2021

Yes, but.  There are a lot of those in the 275 install manual.  For lightning protection you can not connect an analog nav such as the KX155 to the Primary ADI. It can be connected to a standby ADI or MFD.  Yes the 275 will show 2 bearing pointers, pointer 1 can be GPS 1 or Nav 1, pointer 2 can be GPS 2 or Nav 2.

I have a 275 Primary ADI + AP connected to my GNX375 and a 275 Primary MFD/standby ADI connected to a KX165.  It all works together as it should, the Stec autopilot will follow anything selected.  Thru sometime in August, Garmin has a promo on the dual 275 bundle.

Ragsf15e

Posted July 12, 2021

Ragsf15e

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Posted July 12, 2021

The G5s is similar with its bearing pointer.  No analog nav 2 is allowed.  You can actually have a bearing pointer set up on vloc nav 1 showing the current vor bearing while navigating on the nav 1 gps (gns430w) with magenta cdi.

However, why do you really need this if you’ve got 1 or maybe 2 waas gps?  Replace the adf by typing in the adf identifier in the gps and go…

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OR75

Posted July 12, 2021

OR75

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Posted July 12, 2021

if you are getting a used GNS430W, you must be cost conscious (nothing wrong with that, it is a good unit)

What i would do::

connect your #1 GNS430W to a G5 and use the GPSS feature (with GMU11,GAD29B and GAD13)

connect your #2 GNS430W to the GI106 you currently have    

  

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NicoN

Posted July 13, 2021

NicoN

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• Model: M20K from 1980, EDM830, GNS430W; Century 21

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Posted July 13, 2021

@David Lloyd: Do you have the install manual available? I think , that would be interesting to check out all the options

 

NicoN

Posted July 13, 2021

NicoN

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Posted July 13, 2021

BTW: Does an lod analog A/P learn GPSS mode with a GI275 (provided we have a GMU11, GAD interface and OAT) ?

David Lloyd

Posted July 13, 2021

David Lloyd

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Posted July 13, 2021

The G5 installation manual and pilot guide are on the Garmin website as is the GI-275 pilot guide.  Garmin does not distribute installation manuals for their certified aircraft equipment to anyone except their approved shops and installers.  So, for the GI-275, we will only know about the options mentioned in the pilot guide or what we read about online.  Just this week, I tried to figure out what the volume control in the GI-275 does.  No mention in the pilot guide.  Might be a new feature with the last software update.  Shop did not know.  It might control the volume of the detent clicks as you turn the selection knob, but apparently not the volume of various alerts.  I really like my GI-275s, others like their G5s, both are much more capable than older mechanical units.  Mechanical units were easy to document; here is what it does.  The GI-275 is much more difficult; here are some of the things it will do today, more features and capabilities coming soon.

GI-275 with auto pilot (kind of a GAD interface) will emulate GPSS.  A list of compatible autopilots is on the Garmin site.  OAT is recommended but optional.

NicoN

Posted July 13, 2021

NicoN

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Posted July 13, 2021

Thank you. I thought, GPSS is a feature of the GPS-device, which can calculate appropriate heading commands out of GPS position, Airspeed (from GI 275?), Alt, OAT and MH.

AFAIk GPSS is done by constantly turning the Heading bug (invisible)

David Lloyd

Posted July 13, 2021

David Lloyd

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Posted July 13, 2021

GPS just provides the signal to follow.  Some auto pilots have GPSS built-in, others don't.  The ones that don't, the G5 or GI-275 will take the GPS signal and relay that to the auto pilot when in GPSS mode.  GPSS will be more accurate and stable than just following the nav needle.  Your auto pilot could also follow the HSI heading bug on the G5 or GI-275. Or your auto pilot could track the nav needle on the  HSI.  Someone else might explain that a little better but I think that is accurate.

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• 11 months later...

Fly Boomer

Posted July 13, 2022

Fly Boomer

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Posted July 13, 2022

On 7/13/2021 at 7:24 AM, NicoN said:

AFAIk GPSS is done by constantly turning the Heading bug (invisible)

Michael Kaufman writes about it here: https://midwestflyer.com/?p=4293

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