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en:help:v2:orientation [2016/06/12 13:53]
alpinequest [The compass view]
en:help:v2:orientation [2018/03/07 12:59] (current)
alpinequest
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-<​sub>​[[en:​help|Online Help]] > [[en:​help:​v2|AlpineQuest 2.x]]</​sub>​+<​sub>​[[en:​help|Online Help]] > [[en:​help:​v2|AlpineQuest 2.x]] > Orientation & Compass</​sub>​
  
 ====== Orientation & Compass ====== ====== Orientation & Compass ======
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 To turn on the compass, you can either: To turn on the compass, you can either:
-  * Long-press the "**''​Compass''​**" ​menu button ​{{:​icon_01.png?​nolink}};​ +  * Long-press the ''​"​**Compass**"​'' ​{{:​icon_01.png?​nolink}} ​menu icon
-  * Click on the sub-menu toggle {{:​icon_03.png?​nolink}}.+  * Tap the sub-menu toggle {{:​icon_03.png?​nolink}}.
  
 {{ :​en:​help:​v2:​orientation:​submenu.jpg?​nolink}} {{ :​en:​help:​v2:​orientation:​submenu.jpg?​nolink}}
  
-The "''​**Compass**''​" menu button ​{{:​icon_01.png?​nolink}} color lets you know the current state: +The ''​"**Compass**"''​ {{:​icon_01.png?​nolink}} ​menu icon color lets you know the current state: 
-  * When the icon is white, the "''​**Compass**''​" ​is turned off. Long-press the button to turn it on; +  * When the icon is white, the ''​"**Compass**"''​ is turned off. Long-press the button to turn it on; 
-  * When the icon is green, the "''​**Compass**''​" ​is turned on. Long-press the button to turn it off.+  * When the icon is green, the ''​"**Compass**"''​ is turned on. Long-press the button to turn it off.
  
 \\ \\
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 ===== The compass menu ===== ===== The compass menu =====
 \\ \\
-Click on the "''​**Compass**''"​ {{:​icon_01.png?​nolink}} menu button to display the compass menu, composed of the following items: +Tap on the "''​**Compass**''"​ {{:​icon_01.png?​nolink}} menu button to display the compass menu, containing ​the following items: 
-  * The "**''​Compass''​**" {{:​icon_02.png?​nolink}} button opens the compass ​details window+  * The "''​**Compass**''​" {{:​icon_02.png?​nolink}} button opens the compass ​view
-  * The "**''​Compass toggle''​**" {{:​icon_03.png?​nolink}} lets you turn on or off the compass ​feature ​easily; +  * The "''​**Compass toggle**''​" {{:​icon_03.png?​nolink}} lets you turn on or off the compass easily; 
-  * The "**''​Display ​compass''​**" {{:​icon_04.png?​nolink}} check-box controls either or not to display a compass {{:​icon_08.png?​nolink}} on the map; +  * The "''​**Rotate the map (using ​compass)**''​" {{:​icon_04.png?​nolink}} check-box controls either or not to rotate ​the map based on the compass north to match the real direction you are looking at
-  * The "**''​Rotate ​the map''​**" {{:​icon_05.png?​nolink}} check-box controls either or not to rotate the map based on the compass ​north to match the real direction you are looking at+  * The "''​**Display compass on the map**''​" {{:​icon_05.png?​nolink}} check-box controls either or not to display a compass ​{{:​icon_08.png?​nolink}} on the map
-  * The "**''​Current heading''​**" {{:​icon_06.png?​nolink}} check-box controls either or not to display an information box {{:​icon_07.png?​nolink}} on the map with your current heading.+  * The "''​**Current heading**''"​ {{:​icon_06.png?​nolink}} check-box controls either or not to display an information box {{:​icon_07.png?​nolink}} on the map with your current heading.
  
-{{:​icon_help.png?​nolink}} You can un-check both "**''​Display ​compass''​**" and "**''​Rotate ​the map''​**" check-boxes to display ​a small current ​heading arrow {{:​icon_09.png?​nolink}}.+{{:​icon_help.png?​nolink}} You can un-check both "''​**Rotate the map (using ​compass)**''​" ​{{:​icon_04.png?​nolink}} ​and "''​**Display compass on the map**''​" ​{{:​icon_05.png?​nolink}} ​check-boxes to display ​your current ​[[https://​en.wikipedia.org/​wiki/​Field_of_view|field of view]] ​{{:​icon_09.png?​nolink}}
 + 
 +{{:​icon_help.png?​nolink}} You can replace the field of view {{:​icon_09.png?​nolink}} display by a heading line {{:​icon_10.png?​nolink}} from the main application [[en:​help:​v2:​settings|settings]],​ under "''​**Current heading display**''"​.
  
 {{ :​en:​help:​v2:​orientation:​on-map-orientation.jpg?​nolink }} {{ :​en:​help:​v2:​orientation:​on-map-orientation.jpg?​nolink }}
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 {{ :​en:​help:​v2:​orientation:​compass-view.jpg?​nolink}} {{ :​en:​help:​v2:​orientation:​compass-view.jpg?​nolink}}
 \\ \\
-The "**''​compass view''​**" ​gives you the following information:​ +The ''​"​**compass view**"​''​ contains ​the following information:​ 
-  * The true (geographic) north direction, pointed by the red arrow {{:​icon_01.png?​nolink}}. +  * The ''"​**direction ​to the north**"''​, pointed by red arrow {{:​icon_01.png?​nolink}}. 
-  * The **precise heading** arrow {{:​icon_02.png?​nolink}},​ when this one is between -20° and +20°, including mils graduation;​ +  * The ''"​**precise heading**"'' ​arrow {{:​icon_02.png?​nolink}},​ when this one is between -20° and +20°, including mils graduation;​ 
-  * A **pitch and roll** level {{:​icon_03.png?​nolink}},​ helping you to keep the device flat; +  * A ''"​**pitch and roll**"'' ​level {{:​icon_03.png?​nolink}},​ helping you to keep the device flat; 
-  * The **magnetic declination** at your current location {{:​icon_04.png?​nolink}}, ​which is the difference between the magnetic north and the geographic (map) north. The application uses either the last known location of your device if any, or the screen center location. This value is computed each time you activate the compass+  * The ''"​**magnetic declination**"'' ​at your current location {{:​icon_04.png?​nolink}}, ​see below for more details
-  * The **direction** {{:​icon_05.png?​nolink}} ​to the target, if a location is set as target.+  * The ''"​**direction ​to the target**"'',​ pointed by a green arrow {{:​icon_05.png?​nolink}},​ if a location is set as target.
  
 \\ \\
  
-===== The compass settings =====+==== Magnetic declination ​====
 \\ \\
-By default, the compass ​has a moving rose and graduations (the "**''​Topochaix''​**" ​style). You can change it to a moving needle and still graduations {{:​icon_04.png?​nolink}}:​ +A magnetic ​compass ​points ​the ''​"**magnetic north**"''​ (the top direction of the magnetic fieldwhich is different from the ''​"**true north**"''​ (the top direction of the map, also called ​''"​**geographic north**"'' ​or ''​"**map north**"''​).
-  * Click on the "**''​Settings''​**" ​{{:​icon_01.png?​nolink}} icon to open the settings dialog; +
-  * Click on the style list {{:​icon_02.png?​nolink}} and select "**''​Standard''​**"+
-  ​Click on "**''​OK''​**" ​{{:​icon_03.png?​nolink}} to validate.+
  
-{{ :en:​help:​v2:​orientation:​settings.jpg?nolink }}+In order to give you the direction of the true north, the application tries to compute the ''"​**magnetic declination**"'' ​{{:icon_04.png?​nolink}} ​(also called ''"​**magnetic variation**"''​),​ which is the angle difference between the magnetic north and the true north, at your current location. It's usually just a few degrees, but may be more if you're close from a pole. 
 + 
 +To compute this value, the application needs to know your physical location. It 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. When turning on the compass, be sure to points the map over your approximate current location to get a correct declination,​ in case your GPS location is not known.
  
 \\ \\
  
-===== Problems with the compass ===== +===== The compass ​settings ​=====
- +
-==== Compass won't turn on ====+
 \\ \\
-If you can't turn the compass ​on, it means that your device doesn'​t have magnetic sensor built in, which is required to get the direction of the northRecent versions confirm ​it by displaying this message when trying ​to turn on the compass:+By default, ​the compass ​has moving rose and graduations {{:​icon_01.png?​nolink}} (the ''"​**Topochaix**"''​ style)You can change ​it to a moving needle with still graduations {{:​icon_05.png?​nolink}}:​ 
 +  * Tap on the ''"​**Settings**"''​ {{:icon_02.png?​nolink}} icon to open the settings dialog; 
 +  * Tap on the style list {{:​icon_03.png?​nolink}} and select ''"​**Standard**"'';​ 
 +  * Tap on ''"​**Ok**"''​ {{:​icon_04.png?​nolink}}.
  
-{{ :en:help:v2:orientation:sensor-error.jpg?nolink }}+If you need the magnetic north direction instead of the true north, or if you believe that your device already applies the declination offset ​{{:icon_06.png?​nolink}},​ you can turn this computation off: 
 +  * Tap on the ''"​**Settings**"''​ {{:icon_02.png?​nolink}} icon to open the settings dialog; 
 +  * Un-check ''"​**Compute declination to get true (geographical) north**"''​ {{:icon_07.png?​nolink}};​ 
 +  * Tap on ''"​**Ok**"''​ {{:icon_04.png?nolink}}.
  
-Note that you can still use the map rotation using the GPS (if available), from the GPS Location menu.+{{ :​en:​help:​v2:​orientation:​settings.jpg?nolink }}
  
 \\ \\
  
-==== Compass gives incorrect direction ​====+===== Problems with the compass =====
 \\ \\
-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 won't turn on**\\ 
 +{{ :​en:​help:​v2:​orientation:​sensor-error.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:​v2:​geolocation|Positioning]] 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.\\ 
-=== Compass need to be calibrated === +If you still get wrong directionit usually ​means that the magnetic sensor ​needs to be calibrated. This is fast and easy:
-\\ +
-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:​v2:​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**\\ 
-{{ :​en:​help:​v2:​orientation:​problems-declination.jpg?​nolink}} +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 declination or if you believe that your device already apply 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}}.
  
-\\+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.
  
-=== Inverted poles === +{{ :​en:​help:​v2:​orientation:​problems-sensor.jpg?nolink }}
-\\ +
-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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