BOAC:
2) Is there a reference for the use of 'FN' - I suspect it is a TERPS point rather than a PANSOPS point, and should that chart not be annotated 'RNAV or perhaps 'APV(Baro)' in PANSOPS? I've been all over Jepp (on-line) and have not found anything.
Any time a fix is in bracketts [FN26] it is a CNF; computer navigation fix. This is in the domain of RTCA and FMS engineers. It is neither TERPS nor PANS-OPS; rather it is a method of doing an FMS overlay of any ground-based procedure. If the state (India in this case) does not authorize RNAV overlay of the procedure per se, then it goes to the operator's authorization whether or not the underlying nav aid must also be monitored while flying the LNAV (RNAV) overlay.