Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-05 Thread John Denker
On 01/05/2007 04:06 AM, Torsten Dreyer wrote: > Less dirty and more correct should be: > relocate to the position of the fix, grab the magnetic variation and > calculate > the transporter coordinates using bearing and distance. Relocate again to > these coordinates. You can safely call this pos

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-05 Thread Torsten Dreyer
> A dirty hack might be to relocate to the new position using the true > bearing, reading the magnetic-variation property for the new position > thereafter and relocate again using the new variation. Less dirty and more correct should be: relocate to the position of the fix, grab the magnetic vari

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-04 Thread Joacim Persson
On Wed, 3 Jan 2007, John Denker wrote: *) I spelled out "deg". I tried putting the ° symbol in the xml file, but it complained of a parse error. Using ° didn't work, either. Any suggestions on how to encode symbols? Not directly an answer to you question but here's a tip that may be us

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-04 Thread Torsten Dreyer
> That's a good point. I consider it a bug in what I've written. > The canonical behavior is to use the magnetic deviation at the > /reference/ point. Can somebody give me a hint how to obtain > the deviation at the location of arbitrary navaids and airports? The magnetic variation is calculated

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-03 Thread Dave Perry
On Wed, 2007-01-03 at 15:36 -0500, John Denker wrote: > First, some background information. Suppose we are up in the air, > 10 nm west of KXYZ airfield (which is colocated with the XYZ vortac). > 1) If we were inbound to the field, I would report our position > as 10 nm west, inbound on the

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-03 Thread John Denker
I found a way to make it do what I want. Here's my version http://www.av8n.com/fly/fgfs/location-in-air.xml and the diff against the cvs version: http://www.av8n.com/fly/fgfs/location-in-air.diff On 01/03/2007 05:19 PM, Curtis Olson wrote: > Only if you are relocating to a nearby position.

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-03 Thread Curtis Olson
On 1/3/07, John Denker <[EMAIL PROTECTED]> wrote: I'm coming at this from the perspective of an instrument flying lesson. Being able to reposition the aircraft a few miles from the initial approach fix saves a lot of time. And that is a perspective we fully want to support and promote . Th

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-03 Thread John Denker
On 01/03/2007 04:00 PM, Curtis Olson wrote: > we do want this to work intuitively so I would welcome > any changes to improve the in-air reposition dialog box. :-) > I think it makes a lot > more sense to focus on the gui dialog box. Agreed. I'm coming at this from the perspective of an instr

Re: [Flightgear-devel] location-in-air ... magnetic bearings from the reference

2007-01-03 Thread Curtis Olson
On 1/3/07, John Denker <[EMAIL PROTECTED]> wrote: First, some background information. Suppose we are up in the air, 10 nm west of KXYZ airfield (which is colocated with the XYZ vortac). [snip] To summarize: With rare exceptions, locations are specified using the bearing /from/ the reference.