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svoop / aipp

AIP parser to convert AIP publications to AIXM or OFMX
https://bitcetera.com
MIT License
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Magnetic bearing #10

Closed svoop closed 5 years ago

svoop commented 5 years ago

Check magnetic bearing. On official charts, QFU (i.e. magnetic RWY direction) is 223°. Perhaps magnetic variation is applied incorrectly?

Screen Shot 2019-08-10 at 21 05 08

(LFMN?)

Reported by Stijn

svoop commented 5 years ago

Indeed, the calculation seems to be the wrong way around the wind rose.

AD-1.3

Screen Shot 2019-10-11 at 21 53 48

AD-2

Screen Shot 2019-10-11 at 21 57 39 Screen Shot 2019-10-11 at 21 57 58

OFMX

Screen Shot 2019-10-11 at 21 59 50
svoop commented 5 years ago

It's a little confusing:

When looking towards the geographic (aka: true) north, a positive declination represents the magnetic north is to the right (aka: east) by this angle.

As for bearings:

To convert a magnetic bearing to the corresponding geographic (aka: true) bearing, the declination has to be added.

For LFMN, this means that the geographic bearing 225 is equivalent to the magnetic bearing 223 (as reads the AD-2) and therefore the the OFMX importer is doing this calculation the wrong way around.

svoop commented 5 years ago

Fixed:

Screen Shot 2019-10-17 at 15 18 05