Technical information
Page 94
6.11.4 Rate of Turn priority scheme
Rate of Turn shall be taken from the highest priority sensor reporting ROT.
ROT shall only be processed if they are from the currently selected Rate of
Turn source. When no Rate of Turn has been received on the selected port for
30 seconds, the port shall be deselected as a Rate of Turn source, and a new
source selected as described above.
6.12 Compatibility mode
Some devices require the use of Compatibility mode for correct operation.
When operating in the standard mode the fix quality flag indicates the type of
GNSS position that is being reported. In compatibility mode, the fix quality
reported will either be No GNSS or GNSS.
On the ‘Home’ > ‘System settings’ > ‘Interfaces’ screen, under the
configuration menu for each sensor port there is an On / Off toggle which can
be set if Compatibility mode is required for that port.
6.13 Message 24 content
The Unit Serial Number transmitted in AIS Message 24B, in response to a
Message 15 request, is encoded as follows (note that these characters
represent individual bits in the data):
wwww wwyy yxxx xxxx xxxx
w = week (0 - 52)
y = years since 2014 (0 - 7)
x = incrementing number (0 - 2047)
6.14 NMEA 2000 PGN List
The PGN’s listed in Table 12. are supported by the AIS transceiver. There are
no unused fields.
PGN
(Dec.)
PGN
(Hex)
Title in NMEA
database
Usage NMEA 0183
059392 0E800 ISO Acknowledgment out
059904 0EA00 ISO Request in, out
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