NorthStar 961 Reference Manual page 32

Chapter 1 - Quick Start
Page 1-18
Using chart views A and B
There are two CHART screens, called chart views, designated
by either VIEW A or VIEW B in the upper right-hand corner of
the view. Chart view B offers the same chart-view functions as
chart view A. Using the second view, you can select a different
zoom level, a different location on the chart, different
navigation information, or even a different chart. You can
switch between the two views by pressing the CHART key.
Both CHART views display electronic versions of actual paper
charts. This means that everything that you're already familiar
with will be displayed right on the CHART screen.
961/962 Operations and Reference Manual, Rev. A
Chart view A