i am a new member in an EAA chapter .
it was suggested at this months meeting that as a project that a Compass Rose [aka compass calibration pad ]be located on the home field.
i did not volunteer to research.
has any group done this ?
my research indicates compass calibration pad iaw AC 150/5300-13A Appendix 6 requires quite the complex geomagnetic survey.
http://www.faa.gov/documentLibrary/m...0_5300_13A.pdf
appx 6
pg 257
Appendix 6.
Compass Calibration Pad
i wonder if the county surveyor could perform to standard adequately to satisfy FAA requirement .
an example of a SOW would be :
A total field magnetic survey of the compass calibration pad. A Total Field Magnetometer will be used to determine if the site is clean of magnetic materials.
A declination survey of the compass calibration pad site to determine the average declination of the compass calibration pad and determine whether the compass calibration pad meets the current standards.
Determinations of true north and magnetic north.
Location where radials should be painted on the compass calibration pad to within one minute of arc of the average measured declination of the site. 12 ordinals .
True azimuths to at least three permanent structures.
Installation of permanent bronze survey markers on the compass rose marking the center of the compass rose, true north, true south, and magnetic north. Markers shall be stamped with appropriate information and recessed below pavement surface.
to me a perfect finished install would be
properly located pad iaw reference marked iaw :
Figure A6-1-compass calibration pad marking marking layout
4 brass pins marked as required : center of pad , TRUE NORTH ,TRUE SOUTH and MAGNETIC North..
year &date of survey
MN [magnetic north ] and box the compass as shown
and in center section [where the aircraft sits] . big letters EAA 734 visible from 10K feet AGL
suggestions , criticisms ,remarks
response is required .
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Worlds largest Compass Rose Edwards