RNAV vectors

Mxsmanic wrote:
Sam Spade writes:


That won't work with the GNS400/500 series.


Direct-To with any type of fix will put a magenta route line on the
map (and potentially other instruments that pull information from the
GPS).


That is not the point. Direct-to on a GNS400/500 will not yield the
unpublished extension of the final approach course unless you happen to
be in the correct position when you activate direct-to. Sure, you will
have a magenta line but it probably won't have a magnetic course of 002,
as per the example IAP.

Mxsmanic wrote:

Sam Spade writes:


That won't work with the GNS400/500 series.


Direct-To with any type of fix will put a magenta route line on the
map (and potentially other instruments that pull information from the
GPS).

That is not the point. Direct-to on a GNS400/500 will not yield the
unpublished extension of the final approach course unless you happen to
be in the correct position when you activate direct-to. Sure, you will
have a magenta line but it probably won't have a magnetic course of 002,
as per the example IAP.

Roy Smith wrote:



Stan,

Just curious why you picked SENNA and not FRZZN as the waypoint. From
"Turn left 10 degrees to intercept the final approach course", I'd assume
I'd intercept outside of FRZZN, but perhaps not outside of SENNA. I would
think -D- FRZZN with a course of 002 would make more sense.

It makes more sense to set up the first published fix in this case,
where the course remains the same. If the clearance were issued
correctly (off route extension of published segment) the clearance would
be to cross SENNA, not FRZZN.

Mark Manes wrote:

Isn't this an RNAV approach?

http://www.naco.faa.gov/d-tpp/0612/09092R35.PDF

Mark


Sure it is. So is this:

http://www.naco.faa.gov/d-tpp/0612/00569G12.PDF

Mxsmanic wrote:
..

Approaches are different, though, since changing them seems to mutate
them into regular routes. I don't use approaches and the like too
much on the GPS, since it's harder to get it working than to fly it by
hand (or by autopilot).


You can do changes to the IAP flight plan sequence prior to the FAF and
the approach mode will still activate as well as the missed approach.

The limiting factor is an unacceptably large angle of intercept to the
FAF as established by Garmin.

"Sam Spade" wrote in message
...

That is not the point. Direct-to on a GNS400/500 will not yield the
unpublished extension of the final approach course unless you happen to be
in the correct position when you activate direct-to. Sure, you will have
a magenta line but it probably won't have a magnetic course of 002, as per
the example IAP.

On the GNS430, Direct-To provides an opportunity to set the course to/from
the waypoint. Press Direct To, enter the waypoint, press Enter, move the
cursor to the course field, set the course, then press Enter again.

"Roy Smith" wrote in message
...

On the 480, I would hit the VTF soft key (assuming I've already got the
approach loaded with some arbitrary IAF selected). At that point, the box
would create a segment from [a point 50(*) miles 182 degrees from FRZZN]
to
FRZZN, make that the active leg (i.e. draw it in magenta on the map), and
go into suspend mode. Assuming I was given a good vector, flew it
correctly, and had sufficient fuel, I would eventually intercept that
segment. At that time the box would automagically come out of suspend
mode. When I reached FRZZN, it would sequence to FRZZN-MAP36 being the
active leg.

(*) I think it's 50 miles. Could be something else, but it's long enough
that it's never been an issue for me.

Roy, apparently VTF works much differently on the 480 than the 430 and
sounds correctly implemented. On the 430, VTF doesn't work properly on a
dogleg approach. It sets up for the dogleg intermediate segment rather than
the extended final course. Have you checked the 480 for a dogleg, such as

http://www.naco.faa.gov/d-tpp/0612/05924VDB.PDF
or
http://www.naco.faa.gov/d-tpp/0612/06712R23.PDF ?

Stan Prevost wrote:
"Sam Spade" wrote in message
...

That is not the point. Direct-to on a GNS400/500 will not yield the
unpublished extension of the final approach course unless you happen to be
in the correct position when you activate direct-to. Sure, you will have
a magenta line but it probably won't have a magnetic course of 002, as per
the example IAP.


On the GNS430, Direct-To provides an opportunity to set the course to/from
the waypoint. Press Direct To, enter the waypoint, press Enter, move the
cursor to the course field, set the course, then press Enter again.



I'll take your word for it. That seems more complicated, though, than
using OBS mode.

Stan Prevost wrote:



On the GNS430, Direct-To provides an opportunity to set the course to/from
the waypoint. Press Direct To, enter the waypoint, press Enter, move the
cursor to the course field, set the course, then press Enter again.



I just tried that on the 530 trainer and it works the same way. On
relection that might be a better way to go in this hypothetical than
using OBS mode.

Stan Prevost wrote:


Roy, apparently VTF works much differently on the 480 than the 430 and
sounds correctly implemented. On the 430, VTF doesn't work properly on a
dogleg approach. It sets up for the dogleg intermediate segment rather than
the extended final course. Have you checked the 480 for a dogleg, such as

It seems to me to work correctly. Using your example of KEKX RNAV 23,
if I select VTF, as you say, I get a track line of 270 magnetic to
JEXUD. That would be the correct course to intercept for vectors to
"final."

The issue is FAA terminology that is predicated on the ILS case.