Garmin 530 WAAS?

Mike Adams wrote:


The 430/530 didn't provide hold guidance prior to the upgrade. The point he was trying to make is that
this feature is part of the same upgrade package, but not specifically related to WAAS. As Sam said, the
big-boy FMSs have provided hold and procedure turn guidance for years, using just VOR/DME or
DME/DME position updating.

So far as I know, although a lot of them used (and still do with the
older birds) DME/DME updating, none of them used VOR/DME updating...well
unless that was all that the system could see...and often it would just
stay with IRU position rather than use a bad solution.

Having said that, the method of flying track-guidance around a holding
pattern does not assure containment (at least in a jet at max holding
speed) unless the FAA holding patterns rules are followed (or the ICAO
rules).

Perhaps Garmin has been smarter than the big guys (they often are).

Sam Spade wrote:

So far as I know, although a lot of them used (and still do with the
older birds) DME/DME updating, none of them used VOR/DME updating...well
unless that was all that the system could see...and often it would just
stay with IRU position rather than use a bad solution.


Yes, airline FMSs are capable of VOR/DME and DME/DME updating, but you are correct that these
modes don't get used much with GPS equipage.

Mike

Stan Prevost wrote:
How are they going to provide outbound guidance in a hold, and make proper
allowance for wind, while allowing a standard rate turn to inbound?

I don't have any idea how they plan to do it. The previous posting is
the first I've heard of it.

I do know that the high-end stuff had done track-guidance holding
patterns for years, but there is no direct relationship to FAA patterns.
But, no one has ever picked the nit about the differences.