Can I Download [UPDATED] A Compass On My Phone

I imagine I am standing at 0 degrees longitude (prime meridian) and 0 degrees latitude (equator). This location is actually in the sea off the coast of Africa but bear with me. I hold my phone in front of my face so that the bottom of the phone points to my feet; I am facing North (looking toward Greenwich) so therefore the right hand side of the phone points East towards Africa. In this orientation (with reference to the diagram below) I have the X-axis pointing East, the Z-axis is pointing South and Y-axis point to the sky.

Now the sensors on the phone allow you to work out the orientation (not location) of the device in this situation. This part has always confused me, probably because I wanted to understand how something worked before I accepted that it did just work. It seems that the phone works out its orientation using a combination of two different techniques.

Can I Download A Compass On My Phone

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Before I get to that, imagine being back standing on that imaginary piece of land at 0 degrees latitude and longitude standing in the direction mentioned above. Imagine also that you are blindfolded and your shoes are fixed to a playground roundabout. If someone shoves you in the back you will fall forward (toward North) and put both hands out to break your fall. Similarly if someone shoves you left shoulder you will fall over on your right hand. Your inner ear has "gravitational sensors" (youtube clip) which allow you to detect if you are falling forward/back, or falling left/right or falling down (or up!!). Therefore humans can detect alignment and rotation around the the same X and Z axes as the phone.

Now imagine someone now rotates you 90 degrees on the roundabout so that you are now facing East. You are being rotated around the Y axis. This axis is different because we can't detect it biologically. We know we are angled by a certain amount but we don't know the direction in relation to the planet's magnetic North pole.Instead we need to use a external tool... a magnetic compass. This allows us to ascertain which direction we are facing. The same is true with our phone.

Now the phone also has a 3-axes accelerometer. I have NO idea how they actually work but the way I visualise it is to imagine gravity as constant and uniform 'rain' falling from the sky and to imagine the axes in the figure above as tubes which can detect the amount of rain flowing through. When the phone held upright all the rain will flow through the Y 'tube'. If the phone is gradually rotated so its screen faces the sky the amount of rain flowing through Y will decrease to zero while the volume through Z will steadily increase until the maximum amount of rain is flowing through. Similarly if we now tip the phone onto its side the X tube will eventually collect the max amount of rain. Therefore depending on the orientation of the phone by measuring the amount of rain flowing through the 3 tubes you can calculate the orientation.

The phone also has an electronic compass which behaves like a normal compass - its "virtual needle" points to magnetic north. Android merges the information from these two sensors so that whenever a SensorEvent of TYPE_ORIENTATION is generated the values[3] array has

values[0]: Azimuth - (the compass bearing east of magnetic north)

values[1]: Pitch, rotation around x-axis (is the phone leaning forward or back)

values[2]: Roll, rotation around y-axis (is the phone leaning over on its left or right side)

So I think (ie I don't know) the reason Android gives the azimuth (compass bearing) rather than the reading of the third accelerometer is that the compass bearing is just more useful. I'm not sure why they deprecated this type of sensor as now it seems you need to register a listener with the system for SensorEvents of type TYPE_MAGNETIC_FIELD. The event's value[] array needs to bepassed into SensorManger.getRotationMatrix(..) method to get a rotation matrix (see below) which is then passed into the SensorManager.getOrientation(..) method. Does anyone know why the Android team deprecated Sensor.TYPE_ORIENTATION? Is it an efficiency thing? That is what is implied in one of the comments to a similar question but you still need to register a different type of listener in the development/samples/Compass/src/com/example/android/compass/CompassActivity.java example.

The phones co-ordinate system is shown in figure B is fixed. Its Y axis always points out the top. The rotation matrix is being constantly calculated by the phone and allows mapping between the two. So am I right in thinking that the rotation matrix transforms the coordinate system of B to C? So when you call SensorManager.getOrientation(..) method you use the values[] array with values that correspond to figure C.When the phone is pointed to the sky the rotation matrix is identity matrix (the matrix mathematical equivalent of 1) which means no mapping is necessary as the device is aligned with the world's coordinate system.

I was having this issue so I mapped out what happens in different directions.If the device is mounted in landscape fashion, eg in a car mount the 'degrees' from the compass seem to run from 0-275 (going clockwise) above 269 ( between west and north) it counts backwards from -90 to 0, then forwards from 0 to 269. 270 becomes -90

Even after calibration, there can be a significant error (up to 45 degrees let's say). But calibrating is annoying, users don't want to do a weird physical excercise looking like idiots every time they want to use a compass feature.

Is there any other reason why then compass on my series 5 watch is wrong? I wear a strap with no magnets and there are no other magnets about that I know of, but the compass on my compared to my the compass on my phone is wrong... I have even used a real compass to compare and the phone is correct by my watch is wrong. Anything I can do to fix or sync them together?

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I would have thought that a GPS based compass would have shown True North, but I have one on my tablet and it is influenced by anything metallic and magnetic local to it. Oddly the clasp on the tablet case is magnetic and really throws it all.

Phone compasses work the same way as real compasses. There are compass apps that use your GPS location to automatically determine your magnetic declination and correct it for you. There are also GPS apps that will have a true north pointer.

The simple solution to this is to either just add or subtract the difference, or get a magnetic compass that lets you adjust in the offset. Now this will only be good for one area, but if you travel, you can easily re-calibrate the declination.

Of the electronic devices I have tried they are very inaccurate. I bought a magnetic stand alone digital compass from a reputable firm. I followed the calibration instructions, took it out with no metal on me, or in any direction for 500 ft. It did not read North when I was facing north, I turned east, south, and west, and back north. I got varying degrees of error. I would hate to rely on this thing out in the back country.

One can purchase digital compasses accurate to a degree or so but they are not cheap. The last time I looked, just the sensing unit was several hundred dollars. And they still required calibrations that involved "swinging the compass" (complete revolutions) multiple times.

For what they're designed to smartphone compasses do a good job.For navigating the night sky accurately, not so much.

Jon

The magnetic north pole is well south of the actual north pole well into Canada. The only line of declination that would be straight in the states is 0. As such, everything else curves as you go north, so you need to know your declination and set it on a manual compass.

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The handy trick of using Google Maps' GPS tracker with your phone data turned off is a life-saver, but that little blue dot showing where you are and what direction you're moving is fairly tiny. My Compass app hack points you in the right direction in a big, bold font and also works without data or internet.

I realized I could map out my upcoming route when I had WiFi on a mapping app (Google Maps, always) and then, once out of the subway station or cab or front door, use my internet-disconnected phone to tell me if I was walking in the direction of my destination. ff782bc1db