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--- manual:faq:wrong_gps_data [2022/05/16 09:39] – created mstupka
+++ manual:faq:wrong_gps_data [2023/10/11 16:25] (current) – mstupka
@@ Line 1: / Line 1: @@
-====== Wrong or inaccurate GPS location ======
+====== Inaccurate or wrong GPS location and elevation ======
 ----
 <WRAP center round important>
-**Important!** Get Locus Map permission for **all-time access to location** and **exclude Locus from all means of battery optimization** so that the app can run in the background.  Instructions on how to do it are summed up **[[manual:faq:gps_lost_fix_android6|here]]** or **[[https://dontkillmyapp.com/|here]]**.
+**Important!**
+Get Locus Map permission for **all-time access to location** and **exclude it from all means of battery optimization** so that the app can run and access location data in the background. Instructions on how to do it are summed up **[[manual:faq:gps_lost_fix_android6|here]]** or **[[https://dontkillmyapp.com/|here]]**.
 </WRAP>
-Locus Map processes location and elevation gain from the data it receives from **your phone GPS**. If the data are incorrect or contain massive deviations, the resulting location fix and elevation gain are incorrect. Locus Map, however, offers a few methods on how to limit these deviations.
+Locus Map processes location and elevation gain from the data it receives from **your phone GPS** and other location/orientation sensors. If the data is incorrect or contains deviations, the resulting location fix and elevation gain are incorrect. Locus Map, however, offers a few methods on how to limit these deviations.
+===== Light deviations =====
-**Open Locus settings > GPS&sensors and set the following**
+**Open Locus Map settings > GPS&sensors and set the following**
   * Location filter > select **medium or heavier filter**
-  * Google Services assisted location > **turn it ON**
+  * Google Services assisted location > **turn it ON** (or OFF, it depends on your device)
-  * Altitude manager > settings tab > SRTM data - select **Optimize GPS values** or **Replace GPS values**
+  * Altitude manager > settings tab > SRTM data - select **Optimize GPS values**
   * Altitude manager > settings tab > Pressure sensor > **turn ON** (if available)
   * Altitude manager > settings tab > Altitude filter - select **medium or heavier filter**
+===== Stronger deviations =====
+Sometimes it happens that the GPS chip is malfunctioning or terrain/weather conditions are so demanding that elevation data is incorrect even after applying the measures mentioned above. Then try the following:
+   * Open Locus Map settings > GPS&sensors > Altitude manager > settings tab > SRTM data - select **Replace GPS values** - this option calculates elevation gain from **offline elevation data** without using GPS
+===== Custom altitude threshold =====
+Those who are still unsatisfied with the result can change the elevation gain calculation by applying a custom altitude threshold:
+  * open **[[manual:advanced:customization:config#expert_settings|Expert settings]]** > Customize altitude threshold > enable it
+  * open a track or route detail > select **Edit** from the bottom menu
+  * change altitude threshold with the slider\\ {{ :manual:faq:threshold.jpg?nolink |}}

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