Jepps..... pitfalls...
#11
China Visa Applicant
Joined: Oct 2006
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From: Midfield downwind
#13
Gets Weekends Off
Joined: Dec 2005
Posts: 4,047
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From: 7ER B...whatever that means.
I was never a trig fan, so I use the 60 to 1 rule, where at 60 DME, each radial is 1 mile apart. So at 15 DME, there are 4 radials per mile. If you're going from 360 to 180 on the 15 DME arc, it'd be 180/4 = 45 NM. I'm not quite sure I understand your equation above because I'm getting 15 NM for a 60 degree change on a 15 DME arc.
The other method sounds good if you got a piece of scratch paper and a calculator but i think this guy just wanted to see if you could do some basic mental math.



