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 position "magnetic bearing from > XYZ, distance NN Miles".
I agree. An alternative implementation of the same idea would be to just call the function that tells you the magnetic variation of a given point. Hint: http://simgear.sourceforge.net/doxygen/classSGMagVar.html I just need to figure out how to call it. ===================================== I have done a fair bit of work on the location-in-air dialog. The latest Denkerized version is at: http://www.av8n.com/fly/fgfs/location-in-air.xml http://www.av8n.com/fly/fgfs/location-in-air.diff New features and other status information: ## In the bottom section of the dialog: ## *) If you leave the altitude blank, ## it defaults to your present altitude. ## *) If you leave the airspeed blank, ## it defaults to your present airspeed. ## *) If you leave the heading blank, ## it defaults to your present heading. ## *) If you leave the radial blank, ## it defaults to your present heading. ## This is particular useful when relocating ## some distance /ahead/ i.e. relative to ## present position. ## *) If you leave the distance blank, ## it defaults to zero. ## *) The radial and the heading are now specified ## in degrees /magnetic/ (not degrees true). Those may seem like small things, but IMHO they make the dialog significantly more usable in flight. ## Known bugs: ## *) Apparently the reset routine refuses to ## apply an offset if the reference point is a lat/lon. ## Maybe we could work around this ... or we could just ## beseech the FDM authors to fix it on their end. ## *) That breaks the "present position" feature also. ## *) We should calculate the magnetic variation at the ## /reference point/ (not at the current position, as ## we do now, which is quick and dirty). ## *) The "trim" function that goes on inside the "reset" ## function is a disaster; for details on this, see below. ## *) Among many disasters, "trim" trashes the throttle settings. ## /and/ my workaround for this doesn't work. ## Kludges and workarounds (to be removed when circumstances permit): ## *) I installed a kludge so that the "reset" thing ## doesn't trash the magneto settings. ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
