CNX-80 "discontinuity"

Peter Clark wrote:

On Thu, 16 Sep 2004 22:16:56 +0200, Maik wrote:


Hmm... until now the only autopilot with GPSS I found are from S-TEC.
Also the extra GPSS box from S-TEC is only for S-TEC autopilots... at
least it is only aloud with S-TEC :-)


The newer Bendix KLN94 (the ones with the part number ending in -0102)
have GPSS out to the KAP140 autopilot.

Good to know. We just got a new Cessna with those parts in our flying
club. I will try it out.


Do you have a link, name or partnumber so I could search for and read a
bit more...?

And normally the GPS is controlling the GPSS and not the vice versa.
Are you sure?


At least on the King ones that's the way I understand it to work -
GPSS sends out roll commands which the autopilot acts on.

Yes, thats the way it works.

Until now, I couldn't find any info about GPSS steering out of the
CNX80.

Maik

On Thu, 16 Sep 2004 11:01:55 -0400, "Steven DalPra"
wrote:

Then keep
the discontinuity in until you have received the ATIS update as to active
approaches and runways. This makes selecting an approach easier

I have noted that on my CNX80, if I leave in the discontinuity, the
calculated time to destination (one of the optional items one can put on
the screen) is inaccurate by a significant amount.


--ron

O.K.,

I give up. What the heck is this "Discontinuity"?! Is it an extra
waypoint created by the box? If so, where is it in relation to the
flight plan? What is it's function?? I've used many different makes of
GPS, both IFR and VFR, but have never come across this "thing". Thanks!

Happy Flying!
Scott Skylane

In article ,
Scott Skylane wrote:

O.K.,

I give up. What the heck is this "Discontinuity"?! Is it an extra
waypoint created by the box? If so, where is it in relation to the
flight plan? What is it's function?? I've used many different makes of
GPS, both IFR and VFR, but have never come across this "thing". Thanks!

Happy Flying!
Scott Skylane

On the CNX-80, routes are made up of waypoints connected by legs. A
discontinuity is what you get when you have a pair of adjacent
waypoints, but you haven't told it how to get from one to the other.

So, if I were to put in:

Origin: KHPN
Destination: KIJD

I would end up with a flight plan that had two waypoints (KHPN and
KIJD), and a discontinuity connecting them. In the units you're used to
using, the flight plan software would have probably just invented a
"direct" leg between those two points, but the CNX-80 doesn't do that.

It's sort of a place-holder for you to fill in more information. In the
case of the KHPN-KIJD flightplan, my clearance was "vectors CMK, V3,
HFD, direct". So, I'd add a CMK waypoint, then, I'd add an airway
segment. I'd get a menu of airways which depart CMK, and I'd select V3
from the menu. Then I'd get a menu of fixes along V3, and I'd scroll
through them to find HFD. When I was done with that, I'd have a flight
plan that looked like:

KHPN
bearing xxx, distance yy.y
CMK
V3
HFD
discontinuity
KIJD

or something like that. I may have messed up on the details a bit, but
that's pretty much the format it's displayed in.

Anyway, if I left it like this and took off, everything would be fine
until a few miles before HFD, when it would start giving me warning
messages about "approaching discontinuity". If I ignore the warnings,
when it gets to HFD, it will (IIRC) go into suspend mode and stop
navigating.

If I clear the discontinuity, it'll insert a "direct to" leg, and I'll
end up with:

KHPN
bearing xxx, distance yy.y
CMK
V3
HFD
bearing xxx, distance yy.y
KIJD

My understanding is that this is how the FMS's the big boys fly with
have always operated.

If you think about how ATC reads clearances to you, it sort of makes
sense. Clearance Delivery read my clearance "cleared to KIJD, via radar
vectors CMK, V1, HFD, direct". If he hadn't said "direct" at the end, I
wouldn't know how to get from HFD to KIJD. Clearing the discontinuity
when you enter the flight plan is essentially programming the "direct"
part.

Roy Smith wrote:
In article ,
Scott Skylane wrote:


O.K.,

I give up. What the heck is this "Discontinuity"?! Is it an extra
waypoint created by the box? If so, where is it in relation to the
flight plan? What is it's function?? I've used many different makes of
GPS, both IFR and VFR, but have never come across this "thing". Thanks!

Happy Flying!
Scott Skylane


On the CNX-80, routes are made up of waypoints connected by legs. A
discontinuity is what you get when you have a pair of adjacent
waypoints, but you haven't told it how to get from one to the other.
/snip/

Thanks, Roy,

That clears it up!

Happy Flying!
Scott Skylane

Please check out Garmin`s site and download the free manual. It covers some
of the basics but the really good stuff is not here.
"Scott Skylane" wrote in message
...
Roy Smith wrote:
In article ,
Scott Skylane wrote:


O.K.,

I give up. What the heck is this "Discontinuity"?! Is it an extra
waypoint created by the box? If so, where is it in relation to the
flight plan? What is it's function?? I've used many different makes of
GPS, both IFR and VFR, but have never come across this "thing". Thanks!

Happy Flying!
Scott Skylane


On the CNX-80, routes are made up of waypoints connected by legs. A
discontinuity is what you get when you have a pair of adjacent waypoints,
but you haven't told it how to get from one to the other.
/snip/

Thanks, Roy,

That clears it up!

Happy Flying!
Scott Skylane