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  #1  
Old 11-06-2019, 09:20 AM
pmillard pmillard is offline
 
Join Date: Nov 2019
Location: Toronto, Ontario, Canada
Posts: 10
Default TruTrak A/P and new Garmin Navigators

Anyone successfully interfaced a TruTrak Vizion a/p with one of the new Garmin IFR navigators, e.g., GPS175, GNX375 or GNC355?

I recently spoke to the guys at TruTrak and they were not aware of anyone yet. The new navigators are not on their approved GPS list. But Iíve got to believe there are installs out there.

Iím hoping the new units output the same RS232 and AIRINC data as the 430 and 650 series. The TruTrak guy seemed to think so.

Iím ready to pull the trigger and order a 175 but want to make sure itís compatible with my existing Vizion a/p. Canít wait to fly those coupled LPV approaches!
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  #2  
Old 11-06-2019, 12:17 PM
wnplt wnplt is offline
 
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Location: Idaho
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Iím sure it will just use the standard ARINC A and B and the RS232 like a 430 or 650.
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  #3  
Old 11-06-2019, 02:34 PM
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g3xpert g3xpert is offline
 
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Location: Olathe, KS
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Quote:
Originally Posted by pmillard View Post
Anyone successfully interfaced a TruTrak Vizion a/p with one of the new Garmin IFR navigators, e.g., GPS175, GNX375 or GNC355?

I recently spoke to the guys at TruTrak and they were not aware of anyone yet. The new navigators are not on their approved GPS list. But Iíve got to believe there are installs out there.

Iím hoping the new units output the same RS232 and AIRINC data as the 430 and 650 series. The TruTrak guy seemed to think so.

Iím ready to pull the trigger and order a 175 but want to make sure itís compatible with my existing Vizion a/p. Canít wait to fly those coupled LPV approaches!
Hello Peter,

We haven't tested this, but it appears that the Vizion 385 uses "Aviation Output 1" RS-232 format and "GAMA Format 1" low speed ARINC 429 format.

The Garmin GPS 175, GNC 355, and GNX 375 navigators all support these formats.

Let us know if we can help further.

Thanks,
Steve
__________________
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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.
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  #4  
Old 11-06-2019, 04:32 PM
pmillard pmillard is offline
 
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Location: Toronto, Ontario, Canada
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Thanks Steve. Thatís good to know.

As a Garmin tech can I ask you one more question? In the Procedures section of the GPS175 Pilotís Guide under Feature Requirements it says that a ďbaro-corrected altitude sourceĒ is recommended (which I donít have) and therefore, altitude leg types require manual sequencing.

What does that mean?

Thanks...Peter
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  #5  
Old 11-06-2019, 05:42 PM
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g3xpert g3xpert is offline
 
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Quote:
Originally Posted by pmillard View Post
Thanks Steve. Thatís good to know.

As a Garmin tech can I ask you one more question? In the Procedures section of the GPS175 Pilotís Guide under Feature Requirements it says that a ďbaro-corrected altitude sourceĒ is recommended (which I donít have) and therefore, altitude leg types require manual sequencing.

What does that mean?

Thanks...Peter
Hello Peter,

You are welcome.

The most common case where it is useful to have a baro corrected altitude source is for missed approaches such as KTOP RNAV (GPS) RWY 18.

The missed approach procedure is "Climb to 1500' then climbing right turn to 3600' direct GUKEC and hold".

When this missed approach procedure is flown with a GPS 175 receiving baro corrected altitude, all leg sequencing is continuous and automatic because the GPS 175 can "watch" you climb to 1500' and automatically transition to the right turn leg after you reach 1500'.

In the absence of this information, leg sequencing is suspended, and the pilot has to unsuspend to activate the right turn leg after the climb to 1500' is complete.

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.
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  #6  
Old 11-07-2019, 06:12 AM
pmillard pmillard is offline
 
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Understood. Thanks so much Steve. The 175 has been ordered!

Peter
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  #7  
Old 12-21-2019, 07:52 AM
pmillard pmillard is offline
 
Join Date: Nov 2019
Location: Toronto, Ontario, Canada
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Quick update. Got the GPS 175 installed and interfaced to the CDI and TruTrak a/p. Took it for a test flight and it works like a freaking dream! Makes beautiful curved intercepts and flys the RNAV LPV approach at my home airport like the plane was on rails. After the overshoot it navigates to the missed approach hold point and flys a perfect, wind corrected holding pattern. Totally cool!,,

Now I know this is old news for those flying the Garmin 430 and 650 navigators but itís all new to me. Iíve got the RV grin but this time itís the LPV grin!,
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  #8  
Old 12-21-2019, 08:16 AM
ALagonia ALagonia is offline
 
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I have the Vizion 385 connected to my Garmin 175 through an ARINC module communicating to my AFS 4500. It flies the LPV approach at my home and local airports like, as it has already been said, as if the airplane is on rails. It corrects for crosswinds in the hold and during the different legs of the approach perfectly.
I sync the altitude, as the Vizion 385 manual says to do before takeoff and the altitude captures are right on the money.
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  #9  
Old 12-21-2019, 10:47 AM
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g3xpert g3xpert is offline
 
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Hello Peter and ALagonia,

Thanks for sharing your success stories on installing the GPS 175.

We expected these new 2" navigators to be very popular with homebuilts where size, weight and affordability are particularly important.

At a MAP price of $4,295 for the GPS 175, many no longer have to consider consider buying older used navigators to add unsurpassed IFR capabilites to their aircraft.

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.
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  #10  
Old 12-21-2019, 12:30 PM
ALagonia ALagonia is offline
 
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After posting above about syncing the Vizion 385 to the altimeter prior to takeoff as per the Vizion manual I started questioning whether that was necessary if the autopilot is being commanded through an ARINC module and my AFS EFIS. So I went out today, just landed, and tried flying the airplane and shooting a coupled approach using the EFIS and the Garmin 175 without syncing the autopilot to the altimeter prior to takeoff. It appears that one does not need to sync the autopilot to the altimeter when using an ARINC module and controlling the autopilot with the EFIS.
One less step to make everything talk nice nice with each other.
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