Kongsberg Seatex AIS 100 Instruction Manual page 85

Seatex AIS 100 Instruction Manual, rev. 5
NOTE Reference systems on which the calculation of vessel course and
speed is based. The values of course and speed are derived directly
from the referenced system and do not additionally include the effects
of data in the set and drift fields.
B = bottom tracking log
M = manually entered
W = water referenced
R = radar tracking (of fixed target)
P = positioning system ground reference.
Heading, Heading status, Vessel course, Vessel speed and Speed
units, are used by the AIS.
RMC - Recommended minimum specific GNSS
data
Time, date, position, course and speed data provided by a GNSS
navigation receiver. This sentence is transmitted at intervals not
exceeding 2 s and is always accompanied by RMB when a destination
waypoint is active. RMC and RMB are the recommended minimum
data to be provided by a GNSS receiver. All data fields must be
provided null fields used only when data is temporarily unavailable.
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External interfaces