Re: [IRCA] 1610 bearings - magnetic declination

[Brett Saylor <bds2@xxxxxxx>]

Good point Fred; I know I wasn't taking that into account. I sent a 
corrected bearing to Jim this morning.

Considering that many people may not have corrected for magnetic 
declination perhaps we should all check this, and re-send our 
measurements? This may help clear up the area of uncertainty a bit,

Brett
> I don't know how everyone is deriving their bearing angles...but if you are
> doing it crudely, like I am, with a portable receiver & a hand compass, you
> have to adjust for magnetic declination to get the true "map north" bearing.
> In my case, here in SW PA, the magnetic declination is 9 deg W.   9 deg can
> make a BIG difference over a distance. Declination varies widely with
> location; it's easy to find yours online. Whether you add or subtract the
> declination from your compass reading depends on where you are. This is a
> very signif potential source of error in our readings. And I can never
> remember whether to add or subtract it; have to figure it out each time!
>
> Fred Schroyer 
> Freelance Science Writer / Editorial Consultant 
> 955 Sixth Street - Waynesburg, PA 15370 
> (40 air mis S of Pittsburgh - 20 air mis N of Morgantown, WV) 
> Home 724-627-8844 - Work 304-599-7830 x 1120 
> freditor@xxxxxxxxxx 
>
>
>
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