Here's a tip to easily calculate the reciprocal bearing for a beam =
headings. Mentally adding or subtracting 180 can be difficult under =
adverse conditions.
If the bearing is less than 180 degrees, add 200 then subtract 20. Easy =
math.
Conversely, if the bearing is greater than 180 degrees, subtract 200 and =
add 20.
Another tidbit, if you deal with bearings divisible by ten, the sum of =
the "tens" plus the "hundreds" will be the same as the sum for the =
reciprocal. Example, for 50 degrees (or 050, if your a purest), the =
reciprocal is 230 degrees. 0 + 5 =3D 5 and 2 + 3 =3D 5. It makes a good =
check of your math.
I learned these from my flying days when sometimes just keeping the =
wings level commanded lots of metal resoures.
Chuck, KE4OAR
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