NorthStar 8000i System Operation Manual page 98

4. Select the button if you want to toggle to the other setting.
5. The new setting is applied immediately and stays until you change it
98
On, the two screens are synchronized. The settings from the Chart
screen such as the zoom level, position, and orientation are also
applied to the 3D Chart screen. Any changes in the Chart screen,
such as when you turn onto a new heading, are automatically
shown in the 3D Chart screen too.
Off, the two screens operate independently
again.
Northstar 8000i Operation Manual