Raymarine GPM400 Reference Manual page 26

None of the preconfigured sets includes a page for the engine
monitor, weather or video applications. To configure a set that
does, or to create a custom set for any combination of applications,
see the Setup and Customizing chapter of this book.
Selecting an application page
Once you have selected the appropriate page set, you can choose
the view you want to use.
To view an application page
1. Press PAGE.
2. Either select the application page you want from the toolbar or
toggle between the applications configured in the page set by
pressing PAGE.
3. Press OK or CANCEL.
G-Series Reference Manual
Selecting application windows
When the selected page has more than one window, the window
that is currently active has a red border. The toolbar applies to the
active window.
Soft keys associated with active window
To change the active window
1. Press ACTIVE to toggle active status between windows (the
red border moves to highlight the active window).
To toggle between multiple- and single-window views
1. In a multiple-window view, press and hold the ACTIVE button
to display the active window at full-screen.
2. Press ACTIVE once more to return to multiple-window view.
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Active window highlighted