Why RNAV approaches appear as GPS? (FMS UNS 1)
Posted by LargoYFoxtrot@reddit | flying | View on Reddit | 21 comments
Does anybody know this? It's the Universal UNS 1 FMS on a C525. RNP Z RWY 08 - SULS
No-Business9493@reddit
Who's letting you fly this airplane without an instrument rating? 😂
Direct_Cabinet_4564@reddit
A lot of you guys are acting like the OP is some kind of retard but the approach plates to SULS (Maldonado, Uruguay) have titles like ‘RNP Z Rwy 08’ and there is no mention of GPS whatsoever on the approach plate. So while GPS is the navaid that is being used, it’s not unreasonable to ask the question ‘why does the FMS use a different name for the approach than what’s listed on the actual approach plate?’
general_nisman@reddit
I think you are not understanding his question. He is asking why in the GNS530 for example, the same approach is called RNAV while in the FMS is called GPS. The difference between names in the software
swakid8@reddit
That is the question….
zeropapagolf@reddit
Because they are GPS approaches.Â
general_nisman@reddit
Yes, but why in the GNS 530 the same approach is called RNAV while in the FMS appears as GPS. We all know the theory of approaches, he wants to know the difference in names…
zeropapagolf@reddit
Is it a soda, or a Coke? One is more precisely descriptive, but it’s the same thing in the end.Â
poser765@reddit
We’re done here, boys.
Direct_Cabinet_4564@reddit
It’s probably just the coding that the software supports. Which is also probably why all the FMS I’ve used don’t specify what version of the approach is actually in the box (X, Y, Z)
x4457@reddit
This is confirmation bias. Most FMSes specifically note which variant of the approach it is - including UNS units with a later software version than the OP is asking about, fun fact.
Direct_Cabinet_4564@reddit
I’m happy for you (really). We had new Universal boxes put in when we had to comply with the ADS B out mandate and although they would do LPV approaches it wouldn’t show what ILS or GPS approach was in the box if there was more than one for the selected runway. The Collins and Honeywell boxes I’m using right now don’t either.
Delicious-Advantage6@reddit
Im just a student , but aren’t all RNAV approaches GPS based? Is he confusing ILS?
Outrageous-Wolf-2599@reddit
These days, essentially yes. But that’s not what RNAV means inherently. Early RNAV systems predate widespread GPS and used other means for point to point nav, which is why you’ll still see this in FMS systems and charts usually use RNAV(GPS) wording.
flyingron@reddit
It could be interial, it could also be VOR and DME based.
Necessary_Topic_1656@reddit
Before GPS, there were RNAV approaches, but they used other systems like LORAN and DME/DME updating and IRS to get the area navigation capability.
But today yes,
MontgomeryEagle@reddit
Nowadays, RNAV and GPS are basically synonymous. That is because aRea NAVigation has gone almost exclusively to GPS.
lnxguy@reddit
There are other types of RNAV approaches and gps is only one of them.
andrewrbat@reddit
Rnp in the usa means something slightly different than it does in icao land and elsewhere, but they both refer to gps approaches.
Area navigation (rnav) can use multiple different nav info sources like gps, vor/dme, and ins/irs/adc, etc.
FixedWinger@reddit
GPS is a type of rnav approach…
Neither-Way-4889@reddit
RNAV usually uses GPS for fixes
rFlyingTower@reddit
This is a copy of the original post body for posterity:
Does anybody know this? It's the Universal UNS 1 FMS on a C525. RNP Z RWY 08 - SULS
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