This is a companion to Geo Discoverer. It acts as a secondary display for displaying navigation infos (e.g., navigation, meters and path info widgets).For example, a device with an epaper display such as the Icarus E653BK, Boyue T61 or Boyue T62 can be used for this purpose. In comparison to LED displays, it can be easily read in direct sunlight. And the screen can be always on with long battery life time. So it makes navigation during tours much more simple because less time needs to be spend on interacting with the navigation device.