> technologies... especially when augmented here in the States by
> WAAS. (And I assume similar augmentation signals exist in some
> other  countries?  Hmm... never looked into that.)

ILS is used at major NZ airports (ISTR Auckland was just upgraded
to IIIB - funny what you take in when it's topical). My acquaintance is
quite confident TLS, WAAS and other instrumentation systems are not
used, which is why he wants to introduce it. As every plane has a
transponder, then TLS is what would be preferable, to save adding
GPS

> I wonder what your friend is planning on using to receive the TLS  
> signals in the aircraft.  Be cautious if he asks you to build something
> to do that... 

He's mentioned buying certified gear and the two of us putting our
heads and experiences together. I think I'm basically on board to
"help". I'm quite aware of the equipment standards expected by
aviation authorities, which is why I wouldn't attempt making anything
from scratch. And especially if someone's already jumped through
all those expensive hoops

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