Using Chart Data - NorthStar 957 Operator's Manual

Using chart data

957 Operator's Manual, Rev. B
the necessary satellite information. This situation usually
occurs in a 957 that's been shipped more than several
hundred miles from Northstar, and often just the first time the
957 is turned on. This first time, the 957 takes two to five
minutes to acquire the necessary information, and after that, is
ready to navigate.
The word NEW in the upper right corner tells you this message
hasn't already been acknowledged. To acknowledge, press the
CLEAR ALARM menu key. As soon as the 957 acquires its
signals, you'll be ready to go.
For details about alarms, see "Using the alarms" starting on
page 22, and see "Understanding alarms" starting on page 118.
You have two choices for viewing chart data:
•
use the 957's built-in Navionics worldwide maps
•
use Navionics' chart-data cartridges
The 957 contains a built-in, low-resolution map that covers the
entire world at a fairly low level of detail. This large-scale set of
maps can give you an approximate idea of your location with
respect to land areas. Nav aids are not included.
For more detailed charting data, you'll want to use Navionics'
highly detailed miniature Nav-Chart™ cartridges. Navionics is
a major producer of high-quality, high-resolution "seamless"
digital charts. The 957's usefulness is greatly enhanced with
cartridges for the areas to which you plan to navigate.
Cartridge data is the result of countless hours of converting
land-mass shapes, nav-aid names and locations, depth
contours and other information found on official paper charts
into an electronic format used by the 957. Each cartridge
includes several charts covering a specific geographic location,
typically providing zoom in and out levels ranging from a
maximum detail of 1/4 nm across the screen to an overview of
up to 256 nm across. Virtually every major port and most
popular boating areas are available on these cartridges, and
new charts are constantly being added. For details about
Chapter 1 - Getting Started
Page 9