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04-18-2019, 12:28 AM
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Join Date: Nov 2017
Location: Tempe, AZ
Posts: 25
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I believe with Option A or B you will also need an audio panel. The GNC 255 has a built in two place intercom.
Quote:
Originally Posted by Draker
Let's say you're sticking with Garmin equipment, building a new IFR-ready panel. You want to tick the following checkboxes: TSO'd WAAS GPS, nav radio for VOR/LOC, ADS-B in/out, what's the difference between the following combinations of equipment:
Option A:
GTN 650 GPS navigator with NAV/COM
GTX 345R Transponder/ADS-B In/Out
$11995 + $4995 = $16990
Option B:
GTN 650 GPS navigator with NAV/COM
GTX 45R Transponder/ADS-B In/Out
$11995 + $3895 = $15890
Option C:
GNX 375 GPS navigator with Transponder/ADS-B In/Out
GNC 255 NAV/COM radio
$7995 + $4495 = $12490
..besides slightly more panel space needed for option C?
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04-18-2019, 03:55 AM
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Join Date: Sep 2013
Location: Rancho San Lorenzo
Posts: 885
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The GTN 650 is taller (2.65"). Than the GNX 375 (2.02"). The GNC 255 is legacy height (1.65"). The GTX 345R can be remotely controlled by the GTN. The GTX 45R is a remote equivalent but can only be controlled by a G3X display, not a GTN, although it can display ADS-B in on a GTN.
Option A - one item on panel
Least panel space height
Option B - one item on panel
Same panel space as option a (least) - but requires G3X
Option C - two items on panel
Most panel space height and no remote LRU
__________________
RV-8
(a few more airplanes too)
Last edited by jliltd : 04-18-2019 at 04:07 AM.
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04-18-2019, 07:06 AM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,039
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Quote:
Originally Posted by g3xpert
The GPS 175 is like the pre-V6.50 GTN 6XX/7XX or the 430W/530W in that it doesn't output A429 VNAV guidance or provide flight planning with a field to enter an altitude constraint at each waypoint as discussed in this posting. Again, this has nothing to do with vertical approach guidance, which it does provide like all GTN and WAAS GNS units.
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Quote:
Originally Posted by nyrikki
While it doesn't tell you what Garmin will choose to support, the Connector Pinout Information from the Part 23 AML STC Maintenance Manual seems to show two ARINC in's and one out even on the GPS 175.
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OK I am confused... As nyrikki stated the manual shows ARINC-429 connections in the connector pinout and in the INTERFASES section of the same manual it states:
"3.3.3.1.1 ARINC 429
The Interfaced Equipment ? ARINC 429 page allows the configuration of data formats and speeds of ARINC 429 inputs and outputs."
So, is ARINC-429 supported or is it a separate option? This will make a difference for many of us.

__________________
Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
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04-18-2019, 07:15 AM
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Join Date: Mar 2006
Location: Newport, TN
Posts: 7,496
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ARINC is built in.
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04-18-2019, 07:22 AM
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Join Date: Mar 2010
Location: KSGJ / TJBQ
Posts: 2,039
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__________________
Galin
CP-ASEL-AMEL-IR
FCC Radiotelephone (PG) with Radar Endorsement
2020 Donation made
www.PuertoRicoFlyer.com
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04-18-2019, 01:03 PM
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Join Date: Dec 2011
Location: Livermore, CA
Posts: 6,797
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Quote:
Originally Posted by Draker
Let's say you're sticking with Garmin equipment, building a new IFR-ready panel. You want to tick the following checkboxes: TSO'd WAAS GPS, nav radio for VOR/LOC, ADS-B in/out, what's the difference between the following combinations of equipment:
Option A:
GTN 650 GPS navigator with NAV/COM
GTX 345R Transponder/ADS-B In/Out
$11995 + $4995 = $16990
Option B:
GTN 650 GPS navigator with NAV/COM
GTX 45R Transponder/ADS-B In/Out
$11995 + $3895 = $15890
Option C:
GNX 375 GPS navigator with Transponder/ADS-B In/Out
GNC 255 NAV/COM radio
$7995 + $4495 = $12490
..besides slightly more panel space needed for option C?
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With A and B, failure of a single box leaves you with no panel mounted navigation. With C it takes two failures.
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04-18-2019, 06:38 PM
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Join Date: Aug 2005
Location: Dallas/Ft Worth, TX
Posts: 5,687
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Quote:
Originally Posted by BobTurner
With A and B, failure of a single box leaves you with no panel mounted navigation. With C it takes two failures.
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I guess you're talking about legal IFR navigation, the G3X screens all have built in WAAS GPS's that work quite well as back up nav source.
__________________
Walt Aronow, DFW, TX (52F)
EXP Aircraft Services LLC
Specializing in RV Condition Inspections, Maintenance, Avionics Upgrades
Dynamic Prop Balancing, Pitot-Static Altmeter/Transponder Certification
FAA Certified Repair Station, AP/IA/FCC GROL, EAA Technical Counselor
Authorized Garmin G3X Dealer/Installer
RV7A built 2004, 1700+ hrs, New Titan IO-370, Bendix Mags
Website: ExpAircraft.com, Email: walt@expaircraft.com, Cell: 972-746-5154
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04-18-2019, 09:24 PM
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Join Date: Jan 2012
Location: Reno, NV
Posts: 446
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175 mounting
Quote:
Originally Posted by Flyhud
I have GPS-175 on order and am just about ready to start cutting my new panel, does anyone have the official panel cutout drawings/dimensions? It doesn’t look like the installation manual is available yet from GARMIN.
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Here you go.
The first is for the 175,
For those interested in the 375, it is a little deeper.
Good luck.
Brian
Last edited by Pdtofly : 04-18-2019 at 09:31 PM.
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04-20-2019, 02:11 PM
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Join Date: Jul 2018
Location: CA
Posts: 227
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Question. Can one GNX375 drive a HSI and a CDI? Specifically two G5's or a G5 and a KI209?
Can a nav/com be hooked up to the same KI209 if the GNX375 is hooked to it as well.
It is my understanding that a G5 has only one input?
Thanks in advance.
__________________
20 dues paid member since 2018
RV6A
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04-20-2019, 02:46 PM
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Join Date: Sep 2010
Location: Olathe, KS
Posts: 2,885
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Quote:
Originally Posted by NewbRVator
Question. Can one GNX375 drive a HSI and a CDI? Specifically two G5's or a G5 and a KI209?
Can a nav/com be hooked up to the same KI209 if the GNX375 is hooked to it as well.
It is my understanding that a G5 has only one input?
Thanks in advance.
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Hello NewbRVator,
You can certainly drive 2 G5 displays with a GNX 375, but we may not understand your entire system. What is your NAV/COM?
Thanks,
Steve
__________________
Garmin G3X Support
g3xpert@garmin.com
1-866-854-8433 - 7 to 7 Central Time M to F
Please email us for support instead of using Private Messaging due to the limitations of the latter.
Last edited by g3xpert : 01-29-2020 at 04:29 PM.
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