NorthStar 961 Reference Manual page 95

Menu keys
Zooming in and out
on the chart screen
961/962 Operations and Reference Manual, Rev. A
NORTH up (usually the same as chart-up, but rotates any
•
charts that were originally skewed to fit a particular
coastline or harbor, so that true north is up on the CHART
screen)
N A north-pointing directional arrow is displayed in the upper
right corner of the screen, indicating each chart's orientation.
The plotter grid, available when there isn't a chart for your
particular area, is always oriented in the north-up direction.
For details about using the CHART SETUP screen to change a
chart's orientation, see "Chart orientation" starting on page
13-28.
Both of the chart views have six menu keys—GO TO, NEW
CHART, OVERLAY, CLEAR, and two INFO keys; collectively,
these keys control a range of chart navigation functions. For a
complete description of these keys, see "Chart-view menu
keys" starting on page 3-6.
Zoom levels
Press the IN key to zoom in for a closer look at the area either
around your vessel or around the cursor (when the cursor is
on the screen). Press the OUT key to zoom out for a wider look
at the area either around your vessel or around the cursor.
Each IN keypress doubles the chart scale; each OUT keypress
halves the chart scale.
You can zoom out to the point where you see the entire chart
within the display screen, and your zoom-in capacity depends
on the individual charts.
Data from the chart CDs is displayed at scales from
approximately
these chart scales show a tremendous amount of detail for the
areas they cover.
Many charts display their maximum detail at the
level. For charts with even higher detail level, you can zoom
all the way in to a
Chapter 4 - Understanding the Chart Screen
nm to approximately 32 nm, and many of
-nm scale.
-nm scale
Page 4-3