Quote:
Originally Posted by EvilGN  2 x dist on arc x 3 is the same thing as dist on arc x 6
keep it simple!
as far as turning onto an arc, 1/2 of 1% of Ground speed is what we teach in the navy. at 120 kts GS, .6 dme, the faster you go, you need more lead time to turn, works for turning over VOR's as well, but dont forget to add altitude for that. ie at 15000 ft at 240 kts, you would use 1.2 DME plus 3 DME (altitude) for a total of 4.2 DME for a lead turn onto another radial. |
I actually tried the navy way because I'd heard of this method. I found that at higfh airspeeds the angle of bank was too extreme sometimes. However that method does work well at slower airspeeds or in certain circumstances, but by all means try it out, there are so many ways to do ifr stuff.
As for why I split up the numbers I use that to remind my self that I'm using 3 as an approximation of pi. That way I remember to add a little fudge factor in, however, if u don't care about that, do what ever u like, just remember these are approximations and it will almost always be necessary to recompute and apply corrections as u go, nothing in aviation is gospel.