Class A GNSS

[jeyjey]

HeyFolks,

just a question concerning GNSS.
At f.e. any of the Oslo STARs there is a reminder on the chart:
P-RNAV (GNSS OR DME/DME, EXCEPT CLASS A GNSS)

what is a Class A GNSS? I cant find some reliable informations regarding GNSS classes...

thanks for any hint!

JeyJey

[Groundloop]

A Class A GNSS is a standalone receiver, Class B and Cs are installed systems integrated with other nav systems such as VOR/DME.