PGN Description Default
update rate
(msec)
Freq (Hz)
127250 Vessel Heading
Heading sensor value with a flag for True or
Magnetic.
If the sensor value is Magnetic, the deviation
field can be used to produce a Magnetic
heading, and the variation field can be used
to correct the Magnetic heading to produce
a True heading.
100 10
127251 Rate of Turn
Rate of change of heading.
100 10
127257 Altitude
Provides a single transmission that describes
the position of a vessel relative to both hori-
zontal and vertical planes.
Altitude can be used for vessel stabilization,
vessel control and onboard platform stabili-
zation.
1000 1
127258 Magnetic Variation
Message for transmitting variation.
The message contains a sequence number to
synchronize other messages such as Heading
or Course over Ground.
The quality of service and age of service are
provided to determine appropriate level of
service if multiple transmissions exist.
1000 1
129025 Position, Rapid Update
Provides latitude and longitude referenced to
WGS84.
A single frame message (opposed to other
PGNs that include latitude and longitude and
are defined as fast or multi- packet), this PGN
lends itself to more frequent transmission
without using excessive bandwidth.
100 10
129026 COG & SOG, Rapid Update
Single frame PGN that provides Course Over
Ground (COG) and Speed Over Ground
(SOG).
250 4
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Supported data | HS75 User Manual
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