Knowledge Base

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{{  :manual:user_guide:ic_map_overlay_alt.png?nolink&}}

====== Map Overlays ======

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===== About =====

This feature enables laying **two maps over each other**  in a semi-transparent mode so that it is possible to compare their details, coverage, accuracy etc. or two maps can complement each other.

<wrap info>Available only with **[[https://www.locusmap.app/premium|Premium]]**</wrap>

===== 1. Select your base map =====

Choose from your [[:manual:user_guide:maps_mmanager|Map manager]]:

  * //Online maps//  - all
  * //Offline maps//  - vector maps (.MAP format), MBT, GEMF and some SQLite databases (Orux SQLite and other formats are not supported)
===== 2. Select your overlay map =====

  * Open the **[[manual:user_guide:mainscr_lpanel|Content panel]]** and tap **Map overlays**.
  * **Activate** the overlay\\ {{ :manual:user_guide:maps_tools:overlay.jpg?nolink |}}
  * The **last used** overlay map is activated. If you want to use another one, open the **selection** of the last used maps. The link to the **map manager** is included:\\ {{ :manual:user_guide:maps_tools:overlay02.gif?nolink |}}

===== 3. Set transparency and blend mode =====

  * Adjust **transparency** of the overlayed map:\\ {{ :manual:user_guide:maps_tools:overlay03.jpg?nolink |}}
  * The **blend mode** of the two maps is **disabled** by default - in most cases, it is not necessary to change this. If necessary, select one from the menu - try which one suits you the best. [[http://ssp.impulsetrain.com/porterduff.html|More about blend modes used in Locus map >>]]. Here are a few examples:\\ {{ :manual:user_guide:maps_tools:blend_modes.png?nolink&350 |}}
  * **Max re-scale** - maximum allowed rate for the [[manual:user_guide:maps_settings#magnify_all_maps|map resolution change]]

===== Deactivation =====
Turn the overlay switch **off** or just tap the **eye** button on the content panel:\\ {{ :manual:user_guide:maps_tools:overlay04.jpg?nolink |}}

===== Example =====

LoMaps center of Prague with and without satellite image map overlay:

{{  :manual:user_guide:maps_tools:overlay2.png  }}

{{  :manual:user_guide:maps_tools:overlay3.png  }}
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