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Compass Readings Meanings Test
602 4 2016-1-17
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jack1144
lvl.4

Canada
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Hi thought I would share a test I did with the compass.
I always wondered what the x,y,z,mod meant so here is what I found.
The x axis is through the aircraft left side to right side
The y axis is through the front to rear
The z axis is through the top to bottom

Assumes the P3 is flat and stationary
If the reading in the sensors of the Go app show:
y=0 the front is pointed north or south
with y=0 and x= (about) 500 (positive) the front is north
with y=0 and x= (about) -500(negative) the front is south

if x=0 the front is pointed east or west
with x=0 and y=(about) 500(positive)  the front is west
with x=0 and y=(about) -500(negative)  the front is east

The z azis is used by the math of the processor when the aircraft is tilted
because the numbers all change when tilted.

Hope this helps

2016-1-17
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Huey_930
lvl.1
Flight distance : 194907 ft
United States
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Does it appear that this may be a reliable method to confirm the calibration of the AC electronic compass?  DId you reach any conclusion regarding the  value of MOD when the AC nose is pointed north.
2016-1-17
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Jkeller84
First Officer
Flight distance : 396854 ft
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United States
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Huey_930 Posted at 2016-1-17 23:30
Does it appear that this may be a reliable method to confirm the calibration of the AC electronic co ...

MOD value should be at 1450 +/- 100
2016-1-17
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Huey_930
lvl.1
Flight distance : 194907 ft
United States
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Jkeller84 Posted at 2016-1-17 20:39
MOD value should be at 1450 +/- 100

Thanks for the info.  I'll see  if I get  roughly duplicate results after calibration and orienting to mag  north.  
2016-1-17
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jack1144
lvl.4

Canada
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Huey_930 Posted at 2016-1-17 23:30
Does it appear that this may be a reliable method to confirm the calibration of the AC electronic co ...

Mod value stays roughly the same regardless of direction the aircraft points.
I seem to always have the 1350 to 1500 mod reading like jkeller says.
I have checked the orientation several times while the P3 is level and it does seem accurate to magnetic north using a handheld compass to compare and compared to known northerly direction.
Not sure what the mod actually is but I think it'stands for modulas and it's number is the result of a formula using square of the x,y,z numbers.
Somebody that knows can chime in  on that.
I'll be doing further testing when the weather breaks.
2016-1-18
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