Zooming In And Out - NorthStar 957 Operator's Manual

Zooming in and out

957 Operator's Manual, Rev. B
To get a closer look at the chart area around your vessel or
around the cursor, press the IN key to zoom in. To see a wider
area, press the OUT key to zoom out. Each press of the IN or
OUT key approximately halves or doubles the chart scale,
respectively.
You can zoom out as far as the 8,192 nm scale, which covers
multiple continents, and zoom in as far as the ¼ nm scale,
which is just 1,320 feet from one side of the screen to the
other.
Data from the Navionics cartridges is displayed at scales from
about 128 nm to about 1/4 nm. Many of these scales show a
tremendous amount of detail for the areas they cover. Your
zoom-in capacity depends on the individual charts. Many
charts display their maximum detail at the ¼-nm scale level.
At this scale, you can use the 957 as a precision plotter. When
you zoom in past the highest detail available for a particular
chart, the center of the chart is magnified to fill the screen and
all text and symbols are doubled in size. Zooming in beyond
this level causes the 957 to remove all chart detail from the
screen for safety reasons, leaving only your vessel, its track,
user-entered waypoints, and the lat/lon grid.
Chapter 4 - Using the Chart Screen
Page 37