Post by LOU on Jan 21st, 2012 at 10:43pm
vans asked:
Re: Waypoint Navigation Accuracy
Reply #7 - Today at 14:28:02 Lou,
I read a tutorial on tracking waypoints by you using the two available DME displays (Tuned to two VORs) to get direction and distance of an approaching waypoint (intersection) onto a new jetway ( I think it was you?).
Just so as not confuse people the proper name is AIRWAYS, not jetways which as you know are used to access the plane.
There are low level airways called Vector Airways (with a V) and high level (FL180+) called Jet Airways (with a J), or HL (high level in Canada).
Here are examples of the same area:
LOW altitude
HIGH altitude
So can I ask, is getting to around 2nm of the waypoint - not the VOR but the waypoint I'm tracking using the two VORs - accurate enough; do you have any advice on calculating a turn onto a new heading to setup an accurate heading on any new leg?
As Mark explaned, there is a bug in FSX, so you may not get the same results on the game as you would in real life. You can try an experiment to see how close you get in FSX. Select an airway and track the center line to an intersection that has both DME and a cross radial. Use both methods to see if the DME and the cross radial match. In real life, the DME is slant range, so there is a small error in the actual position of the plane over the ground. Using a cross radial should eliminate the slant range error. Slant range error is worse as you get closer to the station.
In this example the error is almost a mile.
Where you make the turn at an intersection depends on your speed. In a Cessna doing 100 knots you can pretty much turn at the intersection, but in a jet doing 500 knots you would lead by a few miles since the rate of turn is slower the faster you go.
I didn't know the arc of the radial expanded as such - so I've learnt something. I haven't tried and in fact don't really know radio range but I'm going to have serious look at that!
Don't bother with the radio range because they were phased out in the early 60's! :o
Lou
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Re: Waypoint Navigation Accuracy
Reply #7 - Today at 14:28:02 Lou,
I read a tutorial on tracking waypoints by you using the two available DME displays (Tuned to two VORs) to get direction and distance of an approaching waypoint (intersection) onto a new jetway ( I think it was you?).
Just so as not confuse people the proper name is AIRWAYS, not jetways which as you know are used to access the plane.
There are low level airways called Vector Airways (with a V) and high level (FL180+) called Jet Airways (with a J), or HL (high level in Canada).
Here are examples of the same area:
LOW altitude
HIGH altitude
So can I ask, is getting to around 2nm of the waypoint - not the VOR but the waypoint I'm tracking using the two VORs - accurate enough; do you have any advice on calculating a turn onto a new heading to setup an accurate heading on any new leg?
As Mark explaned, there is a bug in FSX, so you may not get the same results on the game as you would in real life. You can try an experiment to see how close you get in FSX. Select an airway and track the center line to an intersection that has both DME and a cross radial. Use both methods to see if the DME and the cross radial match. In real life, the DME is slant range, so there is a small error in the actual position of the plane over the ground. Using a cross radial should eliminate the slant range error. Slant range error is worse as you get closer to the station.
In this example the error is almost a mile.
Where you make the turn at an intersection depends on your speed. In a Cessna doing 100 knots you can pretty much turn at the intersection, but in a jet doing 500 knots you would lead by a few miles since the rate of turn is slower the faster you go.
I didn't know the arc of the radial expanded as such - so I've learnt something. I haven't tried and in fact don't really know radio range but I'm going to have serious look at that!
Don't bother with the radio range because they were phased out in the early 60's! :o
Lou
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