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en:help:orientation [2016/06/12 14:04]
psyberia [Compass gives incorrect direction]
en:help:orientation [2019/05/08 01:44] (current)
alpinequest
Line 56: Line 56:
  
 ===== Problems with the compass ===== ===== Problems with the compass =====
- 
-==== Compass won't turn on ==== 
 \\ \\
-If you can't turn the compass ​on, it means that your device doesn'​t have a magnetic sensor built in, which is required to get the direction of the north. Recent versions confirm it by displaying this message when trying to turn on the compass: +**Compass won't turn on**\\
 {{ :​en:​help:​orientation:​compass-error-sensor.jpg?​nolink }} {{ :​en:​help:​orientation:​compass-error-sensor.jpg?​nolink }}
 +If you can't turn on the compass, it means that your device doesn'​t have a built-in magnetic sensor, which is required to get the direction of the north. Recent versions of the application display this message when this case occurs:\\
 +Note that you can still use the map rotation using the GPS (if available), from the [[en:​help:​geolocation|Positioning]] menu.
  
-Note that you can still use the map rotation using the GPS (if available), from the GPS Location menu. +**Compass gives incorrect direction**\\ 
- +When using the application compass (just like with mechanical compass), be sure to handle your device in the horizontal position, the screen ​facing the sky.\\ 
-\\ +If you still get wrong directionit usually ​means that the magnetic sensor ​needs to be calibrated. This is fast and easy:
- +
-==== Compass gives incorrect direction ​==== +
-\\ +
-When using the application compass (just like with mechanical compass), be sure to handle your device in the horizontal position, the screen ​looking up. +
- +
-\\ +
- +
-=== Compass need to be calibrated === +
-\\ +
-When you get wrong directions from the compassyou usually ​just need to calibrate ​the magnetic sensor. This is fast and easy:+
   * Turn on the compass;   * Turn on the compass;
-  * Turn your device in the air in all directions;+  * Rotate ​your device in the air in all directions;
   * Done!   * Done!
 +{{ :​en:​help:​orientation:​problems-declination.jpg?​nolink}}
  
-\\+**Wrong magnetic declination**\\ 
 +If calibrating the compass doesn'​t help, or if you see a strange constant offset in the direction, check the magnetic declination {{:​icon_01.png?​nolink}}. As explained above, the application needs to know your approximate current location to compute a valid magnetic declination. Most of the time you just need to be sure that the map points your current location to fix your problem.\\ 
 +If you still believe the computed declination is incorrect or already applied by your device, you can turn off this computation as explained in the settings sections.
  
-=== Wrong magnetic declination === +**Inverted poles**\\ 
-\\ +On some deviceswhen changing ​the screen orientation of 180° (jumping ​to the opposite screen orientationie landscape right to landscape left without ​the intermediate portrait orientation), the compass direction is inverted. Be sure to always select ​the portrait orientationeven temporarily.
-If calibrating the compass doesn'​t helpor if you see a strange constant offset in the direction, check the magnetic declination {{:​icon_01.png?​nolink}}. This value corresponds ​to the difference of angle at your precise location between the magnetic northgiven by the magnetic sensorand the map north, corresponding ​to the top direction of the map. It's usually just a few degreesbut may be more if you're close from a pole.+
  
-To compute this valuethe application needs to know your physical locationIt will first try to use the GPS location ​or the network based location if available, ​otherwise it will use the location displayed at the center of the map. Most of the time you just need to be sure that the map points your current location to get correct declination and fix your problem.+**Sensor issues**\\ 
 +In addition to the magnetic sensoryour device may use other sensors ​to compute a precise and noiseless north directionSome sensors may not work or may not be as reliable as expected on some devices and some may be wrongly reported as available. In some caseschanging ​the default orientation computation method may provide ​better accuracy.
  
-However, if you need to get the magnetic north or if you believe that your device already applies the declination offset, you can just turn this computation off+To do so
-  * In the compass view, click on the "**''​Settings''​**" {{:icon_02.png?​nolink}} icon to open the settings dialog; +  * Tap on the ''​"​**Settings**"​'' ​{{:icon_01.png?​nolink}} icon to open the settings dialog; 
-  * Click on "**''​More''​**" {{:icon_03.png?​nolink}};​ +  * Tap on ''​"​**More**"​'' ​{{:icon_02.png?​nolink}};​ 
-  * Un-check ​"**''​Compute declination to get true north''​**" {{:icon_04.png?​nolink}};​ +  * Tap on the currently used ''​"**Sensor**"'' ​{{:icon_03.png?​nolink}} ​and choose another one
-  * Click on "**''​OK''​**" {{:icon_05.png?​nolink}} ​to validate.+  * Tap on ''​"**Ok**"'' ​{{:icon_04.png?​nolink}}.
  
-{{ :en:​help:​orientation:​compass-settings-declination.jpg?nolink }}+The list of available sensors depends on the device and system version, but usually contains: 
 +  * ''"​**ROTATION_VECTOR**"''​ which uses the ''"​**magnetometer**"'',​ the ''"​**accelerometer**"''​ and the ''"​**gyroscope**"''​ sensors. When available, it usually provides the more precise value; 
 +  * ''"​**MAGNETIC_FIELD**"''​ which uses the ''"​**magnetometer**"''​ and the ''"​**accelerometer**"''​ sensors; 
 +  * ''"​**ORIENTATION**"''​ which uses a device-dependent internal computation.
  
-\\+{{ :​en:​help:​orientation:​problems-sensor.jpg?​nolink }}
  
-=== Inverted poles === 
-\\ 
-On some devices, when changing the screen orientation of 180° (jumping to the opposite screen orientation,​ ie landscape right to landscape left without the intermediate portrait orientation),​ the compass direction is inverted. Be sure to always select the portrait orientation,​ even temporarily. 

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