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  #1  
Old 01-13-2021, 09:00 AM
ConnyJ35 ConnyJ35 is offline
 
Join Date: Mar 2018
Location: Winter Noreay, summer Sweden
Posts: 8
Default Ok to skip NAV radio?

A bit struggling to choose between Garmin 225A COM and 255A COM/NAV.

I will install a G3X and a GNX 375. Most likely I will only fly VFR with my 7 (even if I have Instrument rating), but it is nice to have an IMC approach backup just in case. LPV approaches are possible with the GNX /G3X which would do the trick.

So, any disadvantages with skipping the VOR/ILS radio (and that ugly antenna) and go with just the 225? But I might have missed something?

If I go with the “COM only”, I would have preferred the GTR 200B over the 225 as the 200B intercom apparently is superior of the one the 225, but as I need a radio wit 8,33 spacing it seems the only way to go is the 225.
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  #2  
Old 01-13-2021, 09:29 AM
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mfleming mfleming is offline
 
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 663
Default

You’ll get some pretty passionate responses to this question but I’m not installing anything but a single comm and the GNX 375. There are many of us who believe the VOR/ILS is no longer needed. AND it really simplifies wiring.
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  #3  
Old 01-13-2021, 09:30 AM
crabandy crabandy is offline
 
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,218
Default

Going on 7 years without a VOR/LOC using a 400W and I haven’t missed the Nav function at all.
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  #4  
Old 01-13-2021, 09:32 AM
sailvi767 sailvi767 is offline
 
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,288
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I went with a Dynon HDX and Garmin 175. Did not want the complexity and Antennas involved in a VHF nav installation.
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  #5  
Old 01-13-2021, 09:33 AM
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Raymo Raymo is offline
 
Join Date: Nov 2014
Location: Richmond Hill, GA (KLHW)
Posts: 2,308
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Answer: It depends.

Some DPEs require you to perform a non-GPS approach. If you are already IFR rated, it is only needed as a backup if/when GPS signals are not available (e.g. military jamming).

I am not yet IFR rated, so I plan to install a Nav/Com/GPS navigator for training and to ensure I can do my check-ride in my plane.
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RV-7A - Slider - N495KL - First flt 27 Jan 17
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  #6  
Old 01-13-2021, 09:44 AM
blaplante blaplante is offline
 
Join Date: Jan 2010
Location: Southern California
Posts: 181
Default IFR equipment

I thought I just read something the other day that in Europe there is a requirement for a secondary navigation source if flying IFR? If so, a single box with just GPS would be inadequate per the regulations. Further the 2nd source had to be a different 'box'. Something to check.
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  #7  
Old 01-13-2021, 09:47 AM
blaplante blaplante is offline
 
Join Date: Jan 2010
Location: Southern California
Posts: 181
Default Antennas

Oh, BTW, my VOR antenna is in a wingtip, and my GS antenna is just forward of the rollbar on my slider. No external antennas. You could go simpler yet an only support VOR/LOC (no ILS/GS). That's typically a cheaper radio and you do have a secondary NAV to satisfy comfort and regs.

I see LOTS of GPS unavailable "due to testing" NOTAMS around the military areas out here.
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  #8  
Old 01-13-2021, 09:54 AM
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Carl Froehlich Carl Froehlich is offline
 
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,899
Default

Aircraft mission??

If you (or a someone else) plans on getting their IFR ticket in this plane, install a GTN-650. If not but you want IFR capability, install the Garmin 175.

90 percent of my flying is cross country IFR (GTN-650 and dual screen Dynon SkyView). While all but one of my “real” IFR approaches have been RNAV, I needed the VOR/LOC/ILS function to get my IFR ticket in what was then my new RV-10.

For the next (and final RV) I will still have the dual screen SkyView, but may go with the Garmin 175. If so I’ll install two Dynon radios (I was not impressed with my experience flying behind the Garmin GTR-200B radio - and I assume the 225A is just a modified version of the 200). The decision between the GTN-650 and one Dynon radio or the Garmin 175 and two Dynon radios will be based on what deal I can get.

Carl
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  #9  
Old 01-13-2021, 10:10 AM
dothetime dothetime is offline
 
Join Date: Jul 2015
Location: Boynton Beach, Florida
Posts: 133
Default Nav?

What’s a NAV?
Just kidding.
Dave
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  #10  
Old 01-13-2021, 10:14 AM
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Flyhud Flyhud is offline
 
Join Date: Jul 2018
Location: Burleson, TX
Posts: 104
Default

I installed a MGL N-16 with a Vega controller. It uses SL-30 protocol and works fine with the G3x. It can also functions completely independent of the G3X, which is one reason I went this route. If you decide to skip the vor/ils nav, this is something you could easily add later if you decide you wanted it. The controller needs a standard 2.25” instrument hole.
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