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Per Trig documentation...gdtrfb58 wrote:When inputting (in the HXr Trig-22 set up page) the GPS, it asks for the "level of Certification". Choices are A, B or C. What are these choices referring to (ie: which do I pick? ( have a GNS480)?
6.1.10 GPS Certification Level
An important metric for ADS-B ground system behaviour is the SDA or
System Design Assurance level. It is intended to reflect the probability that
the GPS position source is providing erroneous information, and is based on
the certification standard that was used by the GPS vendor. This will be
indicated in the form of a letter code (A to D) on the data plate or installation
documentation for the GPS in accordance with the standards DO-178B and
DO-254, for example “DO-178B level C”. If both standards are reported but
at different levels, use the lower standard (higher letter).
I do not think you will find this information on your unit. The latest Garmin SB I can find is SA1215 dated 27 Nov 2013, which advises that no Garmin gps (480 included) met the TSO standards for an ADSB position source. Since that time the latest softwRe release (5.01???) has fixed tbe issue for the 400W series, but I do not think there has been a fix issued yet for the 480. Call Garmin to find out.