AIS Message Type 3
AIS Vessel position report using ITDMA (Incremental Time Division Multiple Access)This is the second-most common AIS message type.
Position in BitVector
Description
1-6
Message Type
7-8
Repeat Indicator
9-38
userID (MMSI)
39-42
Navigation Satus
43-50
Rate of Turn (ROT)
51-60
Speed Over Ground (SOG)
61-61
Position Accuracy
62-89
Longitude
90-116
latitude
117-128
Course Over Ground (COG)
129-137
True Heading (HDG)
138-143
Time Stamp (UTC Seconds)
144-146
Regional RESERVED
147-148
Spare
149-149
Receiver Autonomous Integrity Monitoring (RAIM)
149-151
ITDMA Sync State
152-165
ITDMA Slot Increment
166-168
ITDMA Number of Slots
168-169
ITDMA Keep Flag
