FlightPathOBN...tell the whole story!
GBAS is a separate PROPRIATORY VHF transmission system. WAAS or the augmentation thereof is solely within the SBAS system at NO EXTRA CHARGE.
GBAS does give CAT III approach capability EDIT with the addition of ground transmission infrastructures etc...but...at a penny or three.
A very big part of the reason Australia does not buy in to provide the ground based monitoring system to provide the augmentation signal for the WAAS aleady available from the Japanese MTSAT....user pays!
Last edited by OZBUSDRIVER; 12th Jun 2012 at 09:20.