Maybe I can use this thread to ask a related question. Looking at some charts there are RNAV (RNP) and RNAV (GPS) approaches (for example KSFO has both of them). As far as I know, the NGX can only use the RNAV (RNP) approaches, am I right? So what is the difference in between those two. But then there are also RNAV GNSS approaches (for example in Australia), what are these and can the NGX fly them?

Maybe I can use this thread to ask a related question. Looking at some charts there are RNAV (RNP) and RNAV (GPS) approaches (for example KSFO has both of them). As far as I know, the NGX can only use the RNAV (RNP) approaches, am I right? So what is the difference in between those two. But then there are also RNAV GNSS approaches (for example in Australia), what are these and can the NGX fly them?

I can answer some of that.GNSS is a type of GPS approach that requires a groundstation at or near the airport to validate the accuracy of the GPS. The 737NG can be fitted with GNSS capability, but it isn't modeled in the NGX.

Jordan, you're thinking of WAAS/LBAS/GBAS.GNSS stands for "Global Navigation Satellite System", which is a broad term that encompasses technologies such as the US DoD NAVSTAR (aka GPS), as well as systems to be launched by Russia, China and Europe. For the purposes of aviation, GPS and GNSS are nearly interchangeable since there is only one GNSS in the world that is serviceable (i.e. GPS).The NGX is capable of flying any RNAV (GPS), RNAV (GNSS), RNAV (RNP) and GPS approach, with the exception of RNAV (RNP) approaches which require a curved path (i.e. RF leg).

Thanks for the answers. So we can fly all RNAV apporaches with a straight "line" from IAF to the runway. But for me teh question still remains what ist the difference between RNAV(GPS) and RNAV(RNP)?

The area of RNP is a quickly changing subject... but right now RNAV (RNP) is used to denote those approaches which require special training for crew and extra certification by the local aviation safety authority. These approaches can only be used on equipment that allows monitoring of navigation errors and provides suitable alerts to pilots when the navigation system is no longer satisfied that the aircraft is within the permitted tolerance.RNAV (GPS) approaches are available to any pilot who is suitably trained to conduct GPS approaches on the particular receiver and on an aircraft that has a certified receiver. This includes B737NG (in fact, it has two GPSs). On the B737, GPS approaches are conducted in the same way to RNP approaches.In summary, for sim pilots flying the B737NG, there is little difference between RNAV (GPS) and RNAV (RNP) approaches - both are flown in pretty much the same way. The difference exists because not all aircraft are as awesome as the B737NG ;)

Jordan, you're thinking of WAAS/LBAS/GBAS.GNSS stands for "Global Navigation Satellite System", which is a broad term that encompasses technologies such as the US DoD NAVSTAR (aka GPS), as well as systems to be launched by Russia, China and Europe. For the purposes of aviation, GPS and GNSS are nearly interchangeable since there is only one GNSS in the world that is serviceable (i.e. GPS).The NGX is capable of flying any RNAV (GPS), RNAV (GNSS), RNAV (RNP) and GPS approach, with the exception of RNAV (RNP) approaches which require a curved path (i.e. RF leg).

Whoops, yes thanks.