Thankyou everyone for all the inputs:
the Frankfurt procedures:
10-2 is same as Abu Dhabi, GPS required.
transitions: either GPS or FMS required
Thats where the confusion begins
Frankfurt 10-2E is an RNAV Transition e.g. KERAX25N for Rwy 25R involves about 17 waypoints. As compared to a STAR it involves more precision, especially as compared to 10-2 RNAV STAR KERAX1G for Rwy 25R which involves just 1 way point and 2 VORs.
I cant technically understand that in the same area 10-2E (which is much more complex than 10-2) can be flown with either FMS or GPS whereas 10-2 (which involves only 1 waypoint) requires a GPS input to make RNAV status more reliable.
So when its written RNAV (GNSS) then does it mean that GPS input is mandatory?
It seems "Yes" if u look at AbuDhabi charts and looks like "No" if u look at Frankfurt charts
I think its more of a language problem than technical
I understand that requirement can be different in different regions, my query is really about the way its written i.e. RNAV (GNSS). Does it mean the same everywhere or its interpretation is also different in different regions.