I can buy that, Mike. Given access to the air data, the machine can compute
an outbound track and turns to make it work out. But that was my point, the
box needs that data. Most of the GPS-equipped small airplanes have
standalone GPS boxes, no FMS, no ADC.

As Sam mentioned, increasing the bank angle to 30 degrees for the inbound
turn helps in some ways. For a small airplane holding at 90 kts, tracking
an outbound leg offset by 1 nm, and a 30 kt xwind, it just about works out,
IF the pilot knew he needed to use a 30 degree bank turn to inbound. I am a
bit reluctant to encourage pilots to use the higher roll rates associated
with those maneuvers in IMC, for physiological reasons.

I don't think my S-Tec 55 autopilot, without GPSS, could follow the
maneuver, anyway.

Stan


"Mike Murdock" wrote in message
...
"Stan Prevost" wrote:
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?

Stan,

According to a Garmin rep I spoke to at NBAA, it can compensate if it is
connected to an airdata computer. Even the current 430/530 models can be
connected to an ADC, which allows them to display TAS and winds.

-Mike