RNAV vectors

"Stan Prevost" wrote in message
...

You don't have to use OBS mode, at least on the GNS430.

That would imply that there are variations in the way different model GPS
receivers perform.



Use DIRECT TO, then set the course. This way draws a line on the map, OBS
doesn't.


DIRECT TO where? The clearance was to turn ten degrees and join the final
approach course.

"Steven P. McNicoll" wrote in message
k.net...

"Stan Prevost" wrote in message
...

You don't have to use OBS mode, at least on the GNS430.

That would imply that there are variations in the way different model GPS
receivers perform.



Use DIRECT TO, then set the course. This way draws a line on the map,
OBS doesn't.


DIRECT TO where? The clearance was to turn ten degrees and join the final
approach course.


Set the GPS for Direct To SENNA course 002. Then turn ten degrees and join
the final approach course. Complies with the clearance.

In article ,
"Stan Prevost" wrote:

"Steven P. McNicoll" wrote in message
k.net...

"Stan Prevost" wrote in message
...

You don't have to use OBS mode, at least on the GNS430.

That would imply that there are variations in the way different model GPS
receivers perform.



Use DIRECT TO, then set the course. This way draws a line on the map,
OBS doesn't.


DIRECT TO where? The clearance was to turn ten degrees and join the final
approach course.


Set the GPS for Direct To SENNA course 002. Then turn ten degrees and join
the final approach course. Complies with the clearance.

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.

"Roy Smith" wrote in message
...
Set the GPS for Direct To SENNA course 002. Then turn ten degrees and
join
the final approach course. Complies with the clearance.

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.

In Steven's original scenario, the intercept was way south, so I didn't
worry about it too much and didn't give it too much thought, as it wasn't
important to the point under discussion. I don't see any reason that FRZZN
wouldn't work, although having SENNA as a waypoint provides a definite point
where you are established on a published segment of the approach and can
begin descent in accordance with the published procedure. Your clearance
will also contain an altitude to maintain until becoming established on a
published segment. If you are close enough that you might intercept inside
SENNA, the TO waypoint will switch to FRZZN when you pass by SENNA, serving
the same purpose.

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.

Steven P. McNicoll wrote:

Use DIRECT TO, then set the course. This way draws a line on the map, OBS
doesn't.


DIRECT TO where? The clearance was to turn ten degrees and join the final
approach course.


Any point on the final approach course. One of the 480 "DIRECT" modes
is to set a course to/from an the thing you are going "DIRECT" to.
It's one of the options along with "enter a holding pattern at that
point". You're prompted for the course.

The VTF button is a much cleaner way of doing this.

"Ron Natalie" wrote in message
...

Any point on the final approach course. One of the 480 "DIRECT" modes
is to set a course to/from an the thing you are going "DIRECT" to.
It's one of the options along with "enter a holding pattern at that
point". You're prompted for the course.


Is that a universal feature on IFR approach GPS?

"Steven P. McNicoll" wrote in message
nk.net...

"Ron Natalie" wrote in message
...

Any point on the final approach course. One of the 480 "DIRECT" modes
is to set a course to/from an the thing you are going "DIRECT" to.
It's one of the options along with "enter a holding pattern at that
point". You're prompted for the course.


Is that a universal feature on IFR approach GPS?


It is a feature of the Garmin GNS 430/530/480. Don't know about Kings, am
pretty sure the Northstar M3 could do it. I don't think it is a requirement
of the TSOs, but I can't say for sure since I don't have a copy of the TSOs
with the referenced documents.

But any competent IFR pilot can track to any waypoint on any specified
course using bearing information, just like tracking a NDB bearing with an
ADF.

"Steven P. McNicoll" wrote:

Any point on the final approach course. One of the 480 "DIRECT" modes
is to set a course to/from an the thing you are going "DIRECT" to.
It's one of the options along with "enter a holding pattern at that
point". You're prompted for the course.


Is that a universal feature on IFR approach GPS?

You cannot do anything like that on my KLN-90B without suspending waypoint
sequencing. That would seem to me to be a barrier to RNAV vectoring to
final for ATC, since the variability of equipment in this respect cannot be
accounted for.

Perhaps that answers my second question.

--
Dan
C172RG at BFM

"Dan Luke" wrote in message
...

"Steven P. McNicoll" wrote:

Any point on the final approach course. One of the 480 "DIRECT" modes
is to set a course to/from an the thing you are going "DIRECT" to.
It's one of the options along with "enter a holding pattern at that
point". You're prompted for the course.


Is that a universal feature on IFR approach GPS?

You cannot do anything like that on my KLN-90B without suspending waypoint
sequencing. That would seem to me to be a barrier to RNAV vectoring to
final for ATC, since the variability of equipment in this respect cannot
be accounted for.


Can you not use your GPS to navigate to intercept a specified course to a
fix, and track that course, without a line on a moving map? Or without a
CDI? Have you ever flown an NDB approach with an ADF?