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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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Old 01-13-2021, 09:29 AM
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mfleming mfleming is offline
Join Date: Sep 2016
Location: Joseph, Oregon
Posts: 663

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.
Michael Fleming
Joseph, OR
sagriver at icloud dot com

RV-7 Slider #74572
Started 11/2016
Empennage completed 11/2016 (sans fiberglass)
Ailerons and flaps completed 3/2017.
Wings completed 12/2017
Started on QB fuselage 01/2018
Sliding canopy mostly completed 10/2020
Wiring in progress
Donated for 2021 and so should you

Last edited by mfleming : 01-13-2021 at 09:34 AM. Reason: Add content
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Old 01-13-2021, 09:30 AM
crabandy crabandy is offline
Join Date: Jan 2010
Location: Ottawa, Ks
Posts: 2,218

Going on 7 years without a VOR/LOC using a 400W and I haven’t missed the Nav function at all.
RV 7 500 hours and counting
20 donation done
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Old 01-13-2021, 09:32 AM
sailvi767 sailvi767 is offline
Join Date: Sep 2010
Location: Charlotte NC
Posts: 1,288

I went with a Dynon HDX and Garmin 175. Did not want the complexity and Antennas involved in a VHF nav installation.
RV-6 sold
F-1 Rocket
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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

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.
RV-7A - Slider - N495KL - First flt 27 Jan 17
O-360-A4M w/ AFP FM-150 FI, Dual PMags, Vetterman Trombone Exh, SkyTech starter, BandC Alt (PP failed after 226 hrs)
Catto 3 blade NLE, FlightLines Interior, James cowl, plenum & intake, Anti-Splat -14 seat mod and nose gear support
All lines by TSFlightLines (aka Hoser)
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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.
RV6A in phase 2 as of April 2016
Donation made Oct 2020
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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.
RV6A in phase 2 as of April 2016
Donation made Oct 2020
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Old 01-13-2021, 09:54 AM
Carl Froehlich's Avatar
Carl Froehlich Carl Froehlich is offline
Join Date: Dec 2007
Location: Dogwood Airpark (VA42)
Posts: 2,899

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.

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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.
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Old 01-13-2021, 10:14 AM
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Flyhud Flyhud is offline
Join Date: Jul 2018
Location: Burleson, TX
Posts: 104

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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