Si-tex SAS-900, Installation And Operation Manual, Page: 79 / 104

Technical information
Page 77
● GBS
● GRS
● GSA
● GSV
● GFA
When no position has been received on the selected port for 30 seconds, the
port is deselected as a position source, and a new source selected as
described above.
6.11.2 Course and Speed priority scheme
COG and SOG are taken from the highest priority source reporting any one of:
● RMC (with DTM=WGS84 or datum override)
● VTG
● VBW
VTG and VBW are only processed if they are from the currently selected COG
& SOG source. When no COG+SOG has been received on the selected port
for 30 seconds, the port shall be deselected as a COG+SOG source, and a
new source selected as described above.
6.11.3 Heading priority scheme
Heading shall be taken from the highest priority sensor reporting any one of:
● HDT
● THS
HDT and THS are only processed if they are from the currently selected
Heading source. When no heading has been received on the selected port for
30 seconds, the port shall be deselected as a heading source, and a new
source selected as described above