PetitCessnaVoyageur wrote:
I mean, before the introduction of SBAS/WAAS (is it 2006 or 07 they were generalized ?)
Seems that it was earlier, with the Apollo CNX80 (later Garmin GNS480) first GPS navigator to be compliant with TSO-C146A, by 2002.
As an anecdote, when EGNOS was first being tested but when it was transmitting with the “don’t use me for real” flag (which went on for quite a number of years because the Eurocrats had all sorts of bizzare plans e.g. tying EGNOS to Galileo (not the US Navstar system “which was at the mercy of the US president who was going to turn it off anytime he wanted”) and even sell decryption keys for Galileo for flight applications – according to the Galileo website this was claimed to create 100,000 jobs in €-land… with nobody realising that approximately 100% of the equipment is made in the USA where they have zero interest in this sort of crap 
) the original LPV tests were done in Spain, with a CNX80 whose firmware was hacked to disregard that flag 
