"Mike Adams" wrote in message
...
"Stan Prevost" wrote:


"Jose" wrote in message
om...
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?

With ordinary approach certified GPS.


So how does ordinary approach certified GPS do it? None of those I have
used do it.

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.

Mike

But my question is how do they do it? The desired track in a hold is not
the pretty little racetrack pattern with two parallel sides and two
semicircles at each end, except in a no-wind situation. The desired track
on the outbound leg is that which will put you in a position from which a
standard rate turn will roll you out on the inbound track That is why we
fly outbound with a multiple of the inbound wind correction.. The GPS box
cannot do that without knowledge of the wind. A fancy FMS which determines
the wind correction from the autopilot can do that, but how can a standalone
GPS box, WAAS or not, do that?