I'm no GPS expert but have a non aviation handheld GPS 'tracker' unit. This does on occasions pick up the EGNOS satellite (which is think is channel 33) and then reports its accuracy being as good as 5 feet on occasions.
It is intermittent, doesn't always do it but when it does, it displays a D on the status screen .(Presumeably this means differential GPS).
This has been happening for about 2 years I think from memory.
just for fyi