Simrad AP28 Operator's Manual page 122

Magnetic heading – heading relative to magnetic north.
Magnetic variation - A magnetic compass points to the
magnetic north pole. The difference between this
direction and true north is the magnetic variation. The
amount and direction of this variation is dependent upon
where on the earth you are located.
NMEA0183 - A format (language) designed to permit
communication between various types of marine
electronic equipment. In essence this is a two-wire
shielded, serial data link, permitting one device to talk
while other devices listen. Numerous different sentences
are available, permitting communication between various
different devices.
NMEA2000 – A modern serial-data communications
network to interconnect marine electronic equipment on-
board vessels. Equipment designed to this standard will
have the ability to share data, including commands and
status, with other compatible equipment over a single
signalling channel.
PGN – An acronym for Parameter Group Number. PGNs
are used in NMEA2000 analogues with the three capital
letters used in NMEA0183 sentences, e.g. XTE.
Product ID – A number, suffix, acronym or term that
can identify a product.
Product name – The name of a Simrad product known
from sales and other literature.
Route - A stored sequence of waypoints. These
waypoints will be listed in the order in which you desire
to follow them.
SimNet – An acronym for Simrad Intelligent Marine
Network based on the NMEA2000 communication
protocols.
SimNet Class 1 products – Simrad products that are
SimNet controllers, i.e. they have an appropriate display
and routines that can set up and control the SimNet.
SimNet Class 2 products – Simrad products that do not
contain a SimNet controller. When connected to SimNet
they will automatically pick the first available source on
SimNet and lock onto that. When a Class 1 product is
122 | Glossary