adjust documentation

docs/COPY_TO_WAHOO.md

@@ -49,13 +49,16 @@ According to [the Wahoo documentation](https://support.wahoofitness.com/hc/en-us
 
 ## Copy device theme
 Device themes are described [here](TAGS_ON_MAP_AND_DEVICE.md#Device-Theme)
-A theme can be copied to your device like that:
-- ELEMNT/BOLT 
-  - copy "mapsforge-bolt.xml” of folder `common_resources/theme_adjusted` to `maps/mapsforge-bolt/mapsforge-bolt.xml` (just posted this in the google groups)
-- BOLTv2
-  - copy `assets/maps/vtm-elemnt/vtm-elemnt.xml` from the apk. Modify and copy the theme to `maps/vtm-elemnt/vtm-elemnt.xml`
-- ROAM
-  - copy `mapsforge-bolt.xml` of folder `common_resources/theme_adjusted` to `maps/mapsforge-roam/mapsforge-roam.xml`
+In this repo, device themes are stored in folder `device_themes`. There are initial versions and adjusted versions. Both can be further changed to your requirements!
+
+The following table shows the file per device and the location where the device theme needs to be copied to.
+
+| device | file                 | location                                 |
+| ------ | -------------------- | ---------------------------------------- |
+| BOLTv2 | `vtm-elemnt.xml`     | `maps/vtm-elemnt/vtm-elemnt.xml`         |
+| ROAM   | `mapsforge-roam.xml` | `maps/mapsforge-roam/mapsforge-roam.xml` |
+| BOLTv1 | `mapsforge-bolt.xml` | `maps/mapsforge-bolt/mapsforge-bolt.xml` |
+| ELEMNT | `mapsforge-bolt.xml` | `maps/mapsforge-bolt/mapsforge-bolt.xml` |
 
 # Delete temp-files and Clear Cache
 - delete all files from \ELEMNT-BOLT\USB storage\maps\temp\

docs/TAGS_ON_MAP_AND_DEVICE.md

@@ -34,9 +34,19 @@ E.g. roads, locations, ...
 Each entry has a "zoom-appear" attribute, which defines from which zoom level onwards the element will be stored in the map. If zoom-appear is set to 13, the OSM-tag will be stored in the 500m, 200m and 100m zoom levels and therefore could be rendered.
 
 # Device-Theme
-The theme defines, which OSM-tags are shown on the device or in cruiser where the theme should be used if you preview generated maps on your computer.
+The device theme defines, which OSM-tags are rendered on the device. In cruiser, you can also apply the device theme to preview generated maps on your computer.
 
-The theme is named `mapsforge-bolt.xml` or `mapsforge-roam.xml` and is content-wise equal to the `tag-wahoo.xml`
+There are two types of rendering methods: VTM and non-VTM rendering. This table shows the default rendering per device:
+| device | default rendering |
+| ------ | :---------------: |
+| BOLTv2 |        VTM        |
+| ROAM   |      non-VTM      |
+| BOLTv1 |      non-VTM      |
+| ELEMNT |      non-VTM      |
+
+You can enable the VTM rendering method on Wahoo devices other than BOLTv2 by creating a empty file on the device with the name "cfg_BHomeActivity_VtmMaps" in the root folder.
+
+The theme is named `mapsforge-bolt.xml` or `mapsforge-roam.xml` for non-VTM rendering and `vtm-elemnt.xml` for VTM-rendering. It's content is more or less equal to the `tag-wahoo.xml` files.
 
 ## Attribute "zoom-min"
 Each entry in the theme has a "zoom-min" attribute, which defines from which zoom level onwards the element will be shown. If zoom-min is set to 13, the OSM-tag will be displayed in zoom level 500m, 200m and 100m.