Note that no pointers are displayed when no navaids have been selected. The selection of a navaid is done on the radio frequency page of this navaid.
Depending on the selected mode, one or two buttons are displayed on this page.
Tap one button to link the corresponding pointer to the navaid. If the pointer is already linked to another navaid, the button is magenta. Otherwise, it is cyan. If you select this pointer when it is magenta, the link with the other navaid will be removed automatically.
When the navaid is already linked to a pointer, the button of this pointer has a red cross and can be tapped to remove the link and hide the pointer.