Jeppesen Marine Workboat Navigator 1.3 - Manual (Page 55)

Chapter Name 51 Glossary
Glossary
eToken Security Key
A hardware device used for the
purposes of securing software. eToken
Security Keys connect to USB ports.
eToken System ID
The eToken System ID is a unique
number associated with each Jeppesen
Workboat Navigator installation.
Latitude
The designation for angles measuring
how far North or how far South a
position is. Value range is from 90ºS
to 0º at the equator to 90ºN. Latitude
values are represented by the Greek
letter lambda (λ).
Local Notice to Mariner (LNM)
A means for disseminating information
concerning aids and hazards to
navigation and other marine information
of interest to mariners travelling in
the waters of the United States, US
territories, and US holdings. These
notices are essential to all navigators
for the purpose of keeping charts, light
lists, coast pilots and other nautical
publications up-to-date.
The USCG publishes LNM weekly.
Longitude
The designation for angles measuring
how far West or how far East a position
is. Value range is from 180ºE to 180ºW.
Values of longitude are represented with
the Greek letter phi (φ).
Magnetic Variation
The degree to which the magnetic north
differs from the true north. This data is
available from the Compass Rose on a
chart.
MARPA (Mini Automatic Radar
Plotting Aid)
A feature of contemporary radars that
greatly enhances their ability to track
targets, lock on, estimate closest point
of approach, calculate the target’s true
speed and course, and output this
information to other devices.
National Marine Electronics
Association (NMEA)
This organization has determined
a standard, 0183, to which all data
transmission to and from marine
peripherals must conform. The NMEA
issues standards for interfacing marine
electronics devices. Pronounced “nee-
ma”. Not to be confused with NEMA
(National Electrical Manufacturers
Association).
Computers directly connected to NMEA
producing devices (GPS, heading
sensor, etc.) receive raw NMEA data.
This data conforms to the NMEA 0183
(3.01) specification.
See also NMEA 0183.
NavData
A combination of high-resolution,
detailed vector charts and a range of
region-specific supplemental navigation
data, proprietary to Jeppesen Marine.
NavData Permit/Unlock Code
NavData Permits unlock a NavData
region, Unlock Codes unlock
supplemental features.
Your eToken Security Key contains all
current NavData Permits and Unlock
Codes.
Nav Objects
Nav objects are user-created objects
consisting of icons or navigation objects
on the chart. These objects include
Marks, Waypoints, Routes, Annotations,
and Boundaries. Each object has
specific characteristics, called “Object
Properties”, which provide information
about that object. Object properties
include the object name, icon, arrival
circle radius, and so forth. Objects can
be viewed, edited, deleted, imported, or
exported using the Data Manager.
NMEA
See National Marine Electronics
Association.
NMEA 0183
NMEA 0183 defines the electrical
interface and data protocol for
communications between marine
instrumentation. Many times referred
to as “NMEA” in the context of marine
instrumentation communications.