Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 56)

Jeppesen Workboat Navigator Installer’s Guide
52
Glossary
NOAA (National Oceanic and
Atmospheric Administration)
NOAA is a federal agency focused on
the conditions of the oceans and the
atmosphere. NOAA supplies navigation
chart information for the coastal U.S.
and the Great Lakes region.
Port Speed (Baud Rate)
NMEA-0183 defines that all devices
must be opto-isolated RS-422 running at
4800 bits per second (BPS, commonly
referred to as baud). Data characteristics
are 8 data bits, 1 start bit, and 1 stop
bit. Thus each character consists of 10
bits. At 4800 BPS, that results in 480
characters per second.
Port Priorities
Port priorities are used to inform the
program on how to handle any data
conflicts. For example, if there are
multiple GPS devices coming into the
computer, the system needs to know
which one to listen to first. When
a timeout occurs because the unit
is turned off or it lost a signal, the
application falls back to data from a
lesser port.
Product Security Key (eToken)
See eToken Security Key.
Raster Chart
Charts where the chart information is
stored as a rasterized image. Examples
are raster charts are Raster Plus (RPL),
BSB, and GeoTIFF. Rasters are the
scanned images of the original paper
chart.
Repeater
A feature used to output all incoming
NMEA data to other devices.
RS-232
RS-232 has a wiring standard that most
manufacturers follow. Only 3 pins are
commonly used for connecting marine
electronics to computers: Pin 2 is used
to receive data, Pin 3 is used to send
data, and Pin 5 is the ground pin.
For the computer to communicate to a
NMEA device, the transmit data lead is
connected to Pin 2, and the receive data
lead (if any) is connected to Pin 3. The
signal ground lead is connected to Pin
5. If signal ground lead is not present,
it may be necessary to connect the
chassis ground to Pin 5.
It is possible to receive data from one
device and send data to an entirely
different device using a single COM port.
RS-422
A serial interface standard in which
data is sent in a differential wire pair
(two wires, or twisted pair cable), which
allows greater distances, higher data
rates, and improved reliability than
non-differential serial schemes such as
RS-232. RS-422 is the preferred wiring
for communication with the hardware
(see Table 2.1). Many hardware units
are compatible with the RS-422. If an
RS-422 port is not available, a USB
to RS-422 converter may be required.
Jeppesen recommends using a
converter manufactured by SeaLevel.
Serial to USB Converter configurations
vary for the RS-422 pinout for DB9
connections. See Table 2.1 for details.
Sounder
A Sounder uses ultrasonic pulses to
detect the distance to the sea floor,
calculating the time interval between
signal transmission and the detected
reflected signal.
Target Threat
Jeppesen Workboat Navigator is
capable of detecting targets that are too
close to your boat. When you establish
a boundary around your boat, a target
encroaching that boundary is considered
a Target Threat.
Variation
Also known as Magnetic Variation and
Declination. The angular difference
in direction between true North and
magnetic North.
Vector Chart
A chart where chart information is stored
in terms of points, lines and polygons.
NCX, TX-97 and S-57 charts are some
vector chart formats.
View Manager
Screen layout tool that allows you to
determine which hardware products
and features of Jeppesen Workboat
Navigator you wish to display on-screen.