I was on an IFR flightplan from KMVY to KACK in the default C172 using the default Garmin GNS 530, latest xplane12.5.0.r1.

To cut a long route short, I deleted several waypoints on the Garmin FPL page along the way while I was enroute between waypoints DEEPO and CLAMY, south of Martha's Vineyard heading east towards Nantucket Island.

To my surprise, the GPS did not recalculate the resulting new heading for the remaining waypoints, but kept the previous DTK of 179 which would have led to the south pole, but not to Nantucket which was only some 30 miles east, track of 77 degrees. and accordingly, the autopilot (GPS-NAV mode) flew the wrong direction. I had to turn it off and continued manually tracking 077 degrees to waypoint CLAMY.

What am I doing wrong here or is this just another bug in the default GPS?

 

Edited May 3, 20233 yr by turbomax

Why didn't you use the direct to function to the desired waypoint?

33 minutes ago, oldflyguy70 said:

Why didn't you use the direct to function to the desired waypoint?

when you fly an instrument approach you want to follow the STAR with transition and everything. also guarantees terrain clearance, but that is besides the point. I want a GPS that works. like it does perfectly in the other simulator, ehm ... I mean the non-FAA approved "game". 😄

I used to fly around that area a lot "back when".  Used a GNS430.  I tried to replicate your issue but could not.  Using one of the available STAR's for KACK and making up a flight plan from KMVY where I deleted a couple of waypoints (not the current on route one of course) the 530 went to the "next" waypoint.  Full disclosure, never did use a STAR in that area even if IFR.  C182 was a bit slow for that stuff 😁 Rather got vectors for the approach.

I'd try turning the AP on and off and/or re-select CLAMY as the next waypoint.

 

5 minutes ago, Bjoern said:

turning the AP on and off

how more unprofessional can it get?

oldflyguy70 said "Rather got vectors for the approach. "

so in other words it doesn't work correctly and is a bug?

No, I was speaking of my RL experience in that area, that's all.  I did try but could not replicate your issue on my end.  I think I understood what you were describing but I may have got it wrong.

19 minutes ago, oldflyguy70 said:

I was speaking of my RL experience in that area, that's all.  I did try but could not replicate your issue on my end.

thanks flyguy70, we might have met there, I have also flown that route incl. KBID as well in RL but on KingBendix KLN 89B or some such.  it's not about going there direct/vector or whatever but to follow a flight plan that you edit while enroute.

if you say you can not replicate the issue does that mean you can edit a flight plan and the heading to next and following waypoints got updated correctly on the fly, in x-plane 12 that is? 😊

Here is an excerpt from the original manual of the GNS530

 

Zitieren

GNS 530(A) Pilot’s Guide and Reference190-00181-00 Rev. H 5-15
SECTION 5
FLIGHT PLANS
The ‘Activate Leg?’ option is discussed previously in
this section, which allows the pilot to specify which leg of
the flight plan is used for navigation guidance. A shortcut
also exists for this operation, using the Direct-to Key

A change in the flight plan first creates a new flight plan which then has to be activated. The quickest way is to use the shortcut described.

29 minutes ago, turbomax said:

KBID as well

The best.  Flew there often.  A great place even if it got a bit crowded "in season".  Also flew there in the winter.  There were two places (maybe just one) open to eat.  No crowds 😂

54 minutes ago, turbomax said:

does that mean you can edit a flight plan and the heading to next and following waypoints got updated correctly on the fly, in x-plane 12 that is?

Yes.  And as best as I can remember using the 530 in the sim is the same as using the 430 in RL.  I can edit a flight plan.  Insert and/or clear a waypoint.  Change an arrival or approach.

1 minute ago, oldflyguy70 said:

using the 530 in the sim is the same as using the 430 in RL.

can't be. unlike in "the other" simulator, the MENU button does nothing in x-plane.

43 minutes ago, Dirk.M said:

A change in the flight plan first creates a new flight plan which then has to be activated. The quickest way is to use the shortcut described.

thanks very much Dirk, will have to try that. great tip.

The menu button does work in XP.  I promise.  Just used it while trying to figure out your issue.  And I think I said exactly what @Dirk.M advised.  Only he was much clearer...LOL!  I'm a lousy explainer!

Edited May 3, 20233 yr by oldflyguy70

7 minutes ago, oldflyguy70 said:

The menu button does work in XP.

I have to revise the above statement.  The menu button does work but does not have all the RL menu functions.  The models 430/530/1000 that LR uses are quite old.  Perhaps we will get a better (newer) G1000 from a new dev.