September 27, 201312 yr Commercial Member I thought they were listed by precision Depends on the operator and their agreement with their provider. It actually varies by aircraft, too. Apparently the A300/310's system capacity is rather slim, so a certain cargo op has a bear of a time managing which ones are the best selection for where the aircraft flies. A certain operator of some old 757s has a similar issue, coupled with the issue that they can't do any approaches that require GPS (the "...or GPS" approaches are okay, though) because they're IRU/IRU/DME. It's a clever balancing act to determine what all goes in there. Kyle Rodgers
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