Loss of GPS satellite signal while approaching in IMC

[GalinHdz]

Originally Posted by Walt

My point was have an ILS as a backup makes me feel good.

+1
Having a VOR/ILS as backup also makes me feel good about how I equipped my airplane.

[Walt]

Originally Posted by LR60

Walt,

I'm interested in why not recommend the GTX 375 paired with a GNC 255A Nav/Com. This would provide dual nav along with dual source and is several AMU's cheaper than the GTN 650.

I realize the 650 has a few more bells and whistles that the GTX 375 doesn't but what am I missing because I haven' seen this combo in panels. I'm about ready to order my panel and can't decide which path to take regarding this very topic.

Your thoughts?

Thanks

Mark

Your combo comes out a little less (don't forget to add the 2nd comm) but it also has fewer features such as bigger screen, VNAV, integrated operation between GPS/ILS transitions etc..

Once you fly with waypoint crossing altitudes tied to VNAV you'll wonder how you ever lived without.

I also think there are going to be more features coming to the new GTN Xi series that you won't have in the 'budget' navigators.

A valid point about redundancy but the GTN units are basically 3 self contained units in a single box so you can have a GPS failure that won't take down the com/nav side and vice versa.

[Richard Connell]

While rare, RAIM availability (or lack thereof) is an occasional short term operational issue in AUS. No WAAS (yet)
We preflight check availability and pre approach too on the navigator just to be sure.
It’s never affected an actual flight planned arrival for me and the gaps are usually short lived.
Maybe it’s because of no WAAS. Maybe it’s southern latitudes. I dunno.
I’ll also observe that I’ve flown with pilots who don’t check it and it wouldn’t surprise me if some routinely don’t.

[HAL Pilot]

Sooo..... that was kind of near Kennedy space center around the time Air Force one was in the area, getting ready for space X launch. Self defense? Hmmm.

[jpowell13]

I hung an INS429 below my panel in front of the stick. It's low cost insurance against GPS signal loss, GPS failure or EFIS failure. And, because it's a stand alone unit, about all you have to do is provide power, ground and antennas.

I removed a VAL Nav2000 which never worked right for VOR reception and replaced that with a King DME from eBay. It makes VOR/ILS navigation much easier and the used DME's are also easy to install and quite reasonable. (I should qualify that I had the right size slot with power, ground and coax for the Nav radio in place.) John