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This shows you the differences between two versions of the page.

--- en:help:orientation [2015/09/01 10:18] – external edit 127.0.0.1
+++ en:help:orientation [2021/04/23 17:55] (current) – external edit 127.0.0.1
@@ Line 1: / Line 1: @@
 <sub>[[en:help|Online Help]] > [[en:help:orientation|Compass]]</sub>
-====== Orientation and Compass ======
-The compass feature uses the magnetic sensor of your device (if available) to give you helpful orientation information.
+====== Orientation & Compass ======
+\\
+The compass feature uses the magnetic sensor of your device (if available) to give you orientation information.
-This feature is composed of a sub-menu providing a fast access to few controls and settings, and a dedicated window with more details and information.
+To turn on the compass, you can either:
-{{ :en:help:orientation:submenu.jpg?nolink}}
-To turn on the compass feature, you can either:
   * Long-press the "**''Compass''**" menu button {{:icon_01.png?nolink}};
   * Click on the sub-menu toggle {{:icon_03.png?nolink}}.
+The "''**Compass**''" menu button {{:icon_01.png?nolink}} 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 green, the "''**Compass**''" is turned on. Long-press the button to turn it off.
-===== The sub-menu =====
+{{ :en:help:orientation:compass-submenu.jpg?nolink}}
-Click on the "''**Compass**''" {{:icon_01.png?nolink}} menu button to display the sub-menu, composed of the following items:
+\\
-  * The "**''Compass details''**" {{:icon_02.png?nolink}} button opens the compass details window;
+===== The compass menu =====
+\\
+Click on the "''**Compass**''" {{:icon_01.png?nolink}} menu button to display the compass menu, composed of the following items:
+  * The "**''Compass''**" {{:icon_02.png?nolink}} button opens the compass details window;
   * The "**''Compass toggle''**" {{:icon_03.png?nolink}} lets you turn on or off the compass feature 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;
@@ Line 24: / Line 28: @@
 {{: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}}.
-{{ :en:help:orientation:on-map-items.jpg?nolink }}
+{{ :en:help:orientation:compass-on-map-items.jpg?nolink }}
-===== The menu icon =====
-The "''**Compass**''" menu button {{:icon_01.png?nolink}} color lets you know the current state:
-{{:en:help:orientation:menu-off.jpg?nolink}} When the icon is white, the "''**Compass**''" is turned off. Long-press the button to turn it on.
-{{:en:help:orientation:menu-on.jpg?nolink}} When the icon is green, the "''**Compass**''" is turned on. Long-press the button to turn it off.
-===== The details window =====
-{{ :en:help:orientation:compass_view.jpg?nolink}}
-==== Compass view ====
-The "**''compass view''**" {{:icon_01.png?nolink}} is a graphical representation of the true (geographic) north direction, pointed by the red arrow.
+\\
-It also gives you the following information:
+===== The compass view =====
+{{ :en:help:orientation:compass-view.jpg?nolink}}
+\\
+The "**''compass view''**" gives you the following information:
+  * The true (geographic) north direction, pointed by the 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 **heading** value {{:icon_03.png?nolink}}, which is the angle between the geographic north and the current direction you are looking at (the direction of your device);
+  * A **pitch and roll** level {{:icon_03.png?nolink}}, helping you to keep the device flat;
-  * A **pitch and roll** level {{:icon_04.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_05.png?nolink}}, which is the difference between the magnetic north and the geographic 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 **direction** {{:icon_05.png?nolink}} to the target, if a location is set as target.
+\\
-==== Target and navigation ====
+===== The compass settings =====
+\\
+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}}:
+  * 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.
-When a location is set as target, the compass view can be used as a navigation tool, and the following information is given:
+{{ :en:help:orientation:compass-settings-style.jpg?nolink }}
-  * The **name** {{:icon_01.png?nolink}} of the target, if any;
+\\
-  * The **direction** {{:icon_02.png?nolink}} of the target, from your current location, pointed by a green arrow;
-  * The **absolute bearing** {{:icon_03.png?nolink}} of the target, which is the angle between the geographic north and the target, at your current location;
-  * The **distance** {{:icon_04.png?nolink}} of the target, from your current location.
-{{:icon_help.png?nolink}} All these figures are computed from the map center location. Be sure that it's correctly located on your current location, either by moving the map manually or by locking the GPS location on it.
+===== Problems with the compass =====
+\\
+**Compass won't turn on**\\
+{{ :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.
-When you move towards one direction, be sure to orientate your device correctly so that the **lubber line** {{:icon_05.png?nolink}} matches your forward direction. In this case:
+**Compass gives incorrect direction**\\
-  * The azimuth value displayed under the lubber line is your **heading** {{:icon_06.png?nolink}};
+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.\\
-  * The **relative bearing** {{:icon_07.png?nolink}} of the target is displayed, which is the angle between your heading and the bearing of the target, at your current location.
+If you still get a wrong direction, it usually means that the magnetic sensor needs to be calibrated. This is fast and easy:
+  * Turn on the compass;
+  * Rotate your device in the air in all directions;
+  * Done!
+{{ :en:help:orientation:problems-declination.jpg?nolink}}
-{{ :en:help:orientation:compass_target.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.
+**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.
-==== Compass settings ====
+**Sensor issues**\\
+In addition to the magnetic sensor, your device may use other sensors to compute a precise and noiseless north direction. Some 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 cases, changing the default orientation computation method may provide a better accuracy.
-Click on the compass "**''Settings''**" {{:icon_01.png?nolink}} button to open the settings dialog.
+To do so:
+  * Tap on the ''"**Settings**"'' {{:icon_01.png?nolink}} icon to open the settings dialog;
+  * Tap on ''"**More**"'' {{:icon_02.png?nolink}};
+  * Tap on the currently used ''"**Sensor**"'' {{:icon_03.png?nolink}} and choose another one;
+  * Tap on ''"**Ok**"'' {{:icon_04.png?nolink}}.
-If desired:
+The list of available sensors depends on the device and system version, but usually contains:
-  * Click on the "**''Sensor''**" {{:icon_02.png?nolink}} list to request orientation updates from another sensor, if your devices has various sensors. Depending on the device, each sensor can be more or less precise, responsible and noisy;
+  * ''"**ROTATION_VECTOR**"'' which uses the ''"**magnetometer**"'', the ''"**accelerometer**"'' and the ''"**gyroscope**"'' sensors. When available, it usually provides the more precise value;
-  * Un-check the "**''Moving rose and graduations''**" {{:icon_03.png?nolink}} check-box to display the compass with a fixed background rose and moving needle {{:icon_04.png?nolink}}.
+  * ''"**MAGNETIC_FIELD**"'' which uses the ''"**magnetometer**"'' and the ''"**accelerometer**"'' sensors;
+  * ''"**ORIENTATION**"'' which uses a device-dependent internal computation.
-{{ :en:help:orientation:compass_settings.jpg?nolink }}
+{{ :en:help:orientation:problems-sensor.jpg?nolink }}