I'm studying wireless navigation systems, especially GBAS. I have gone through some ICAO documents regarding GBAS. From what I have read, FAS data is included in Message Type 4. Closer examination of FAS data block tells that there is no block ID or sequence number which suggests that FAS data is not sent in chunks.
My question is, how does the on board equipment plot an entire accurate approach path? Since FAS data block has just the coordinates for LTP and FPAP.
I'm not a pilot so my understanding of operational details regarding GLS is pretty basic.