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Chapter 3: Operation
PG No.
(PGN)
127257
127258
129025
129026
Description
Attitude
Provides a single transmission that
describes the position of a vessel relative to
both horizontal and vertical planes. This
would typically be used for vessel
stabilization, vessel control and on-board
platform stabilization.
Magnetic Variation
Message for transmitting variation. The
message contains a sequence number to
allow synchronization of other messages
such as Heading or Course over Ground.
The quality of service and age of service are
provided to enable recipients to determine
an appropriate level of service if multiple
transmissions exist.
Position, Rapid Update
Provides latitude and longitude referenced
to WGS84. Being defined as single frame
message, as opposed to other PGNs that
include latitude and longitude and are
defined as fast or multi-packet, this PGN
lends itself to being transmitted more
frequently without using up excessive
bandwidth on the bus for the benefit of
receiving equipment that may require rapid
position updates.
COG & SOG, Rapid Update
Single frame PGN that provides Course
Over Ground (COG) and Speed Over Ground
(SOG).
32
Default
Update
Freq. (Hz)
Rate
(msec)
1000
1
1000
1
100
10
250
4
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