This article follows up on the Toggle Switch mechanical installation covered in here. 

The following steps assume that the Terrain Command III is already connected to your Android device and selected in the NGH. If that did not happen yet, please check this support article.  

The Toggle Switch configuration can also be done offline (without the controller connected during the configuration process). In that case the configuration will be applied automatically upone next controller connection.

Enable Toggle Switch function in the Controller Settings (showing setup with 2 Toggle Switches. If you only use 1 Toggle Switch, select just one appropriate option):
 

Default controller configuration does not assign any function to the Toggle Switch, except for Terrapirata (bound to roadbook scroll).  

To assign function for general navigation in GPS apps (e.g. for assigning Zooming), select or modify Toggle Switch basic function in the Controller configuration – Global Settings on-screen configuration interface. Toggles are shown in the graphis as 2 separate buttons representing the 2 toggle directions. Each toggle switch direction can be configured separately. Example for configuring one direction on one of the Toggles for Zooming: 

You can modify Toggle Switch function individually for each supported application in the App specific settings menu item. Once clicked, an overview of supported applications is shown. Select the app that you wish to configure. The procedure is generally the same as the Global settings configuration, but applicable only to the selected app. The app specific configuration will load and apply to the controller automatically when you open the app.  

Final and the most important step - ride and enjoy!