Split Screen is available in NavCruiser PRO only. To enable split screen, you must create a layout with "Chart View Primary" and "Chart View Secondary" cells.
Many program features are common to both the primary and secondary chart view such as: rotation mode, data source, zooming, tilt etc... However there is only one control, e.g., menu item, button, etc. per feature. In this case the control operates on the chart view that was last clicked on. By default, the primary view is used.
The intended purpose for split screen was to not interrupt the follow vessel option in the primary chart view. So if you need to pan to a different chart area than where you are currently navigating, you should use the secondary chart view. Also, if split screen is enabled and the software needs to jump to a location in response to an alarm, it will be done in the secondary view. Follow vessel onlys works in the primary chart view.