What Ais Standards Do Exist And Are Valid; Summarized ( Abridged ) Content Of The "Class A" Standard; En61993-2-2002; Summarized ( Abridged ) Content Of The "Class A" Standard : En61993-2-2002 - Weatherdock easyTRX2 Handbuch

User's Manual

17.2. What AIS standards do exist and are valid?

The "Class A" AIS service is described in the document ITU-R M.1371-1
where R stands for „Recommendation".
This „standard document" is valid for AIS data transfer with specifications
for the so-called „Class A" and „Class B" Service.
As mentioned previously, "Class A" Transceivers operate with the so-
called SOTDMA method.
The use of „Class A" Transceivers is mandatory in the professional
shipping as they are obliged to report.
Operation of „Class B" Transceivers is described in document EN62287.
The observation of the properties specified in the standards is obligatory
for „Class B" Transceivers.
„Class B" Transceivers are not mandatory and are commonly used in the
leisure boat area.
The devices of the product line easyTRX2 are „Class B" Transceivers.
17.3. Summarized (abridged) content of the "Class A"
standard: EN61993-2-2002
The telegram of a „Class A" transmission consists of three different types
of messages:
Dynamic information:

MMSI number

position of the ship (derived from GPS)

time, when the position was measured in UTC

course over ground (COG)

speed over ground (SOG)

heading (HOG)
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