The Trackline Report (SPR) communicates a search pattern from the mission controller to a SRU (either to transmit a pattern for action or to cancel a pattern) or from a SRU to the MC (reporting acceptance or completion).
Summary of changes:
Version 0:
This is an RTCM compliant update of the FID 3 message listed in the Oct 2014 EAIS IDD. The FID was changed to avoid confusion with previously published message definitions.
There are AIS Message 25 and 8 variants of this message, but the encrypted message 8 is not implemented.
Unencrypted Trackline Report Segment 1 (Message 8, Broadcast)
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Parameter |
# of Bits |
Description |
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Standard Message Header |
Message ID |
6 |
Identifier for Message 8; always 8. |
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Repeat Indicator |
2 |
Indicates how many times a message has been repeated. 0 – 3; 0 = default; 3 = do not repeat any more. Set to zero (default). |
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Source MMSI |
30 |
MMSI number of source station. Varies according to the transmitter ID. |
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Spare |
2 |
Not used. Set to zero. |
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Binary Data |
Designated Area Code |
10 |
Designated area code (DAC). This code is based on the maritime identification digits (MID). Set to 366. |
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Function Identifier |
6 |
Function identifier. Set to 16. |
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Application Data (unencrypted) |
Version |
3 |
Sequential number used to indicate the message version in steps of 1. 0 = test message = default; 1 – 7 = message version. Set to zero. |
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Message Linkage ID |
10 |
Identifier for the SAR Pattern Report. This number uniquely identifies a search pattern sent from a given SMC (MMSI) and is used to connect additional information with the search. Source MMSI and this ID uniquely identify the event. Set to 1 - 1023 by message originator; 0 = not available. |
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Message Segment |
5 |
Number of this message segment; sequential number. Recipient will need to receive all segments and put in order sequentially. 0 – 31. Set to 0. |
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Number of Segments |
5 |
Total number of segments comprising the complete Trackline Report (Total = N+1). N = 0- 31. |
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Pattern Type |
2 |
Type of search pattern: 0 = Trackline Search Pattern or route = default; 1 = Polygon; 2-3 = reserved. |
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Search Pattern Status |
3 |
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Binary Data |
Application Data (unencrypted) |
Reference Time |
UTC Day |
5 |
UTC Day 1 – 31; 0 = UTC day not available = default. |
UTC Hour |
5 |
UTC Hour. 0 – 23; 24 = UTC hour not available = default; 25 - 31 = reserved. |
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UTC Min |
6 |
UTC Minute. 0 – 59; 60 = UTC minute not available = default; 61 - 63 (reserved for future use). |
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Action SRU MMSI |
30 |
MMSI of the Action SRU. This varies according to the MMSI of the desired unit. 0 = unknown = default; |
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Case ID Number |
30 |
Case ID. Maximum 5 characters 6-bit ASCII as defined in ITU 1371-5, Table 47. “@@@@@” = not available = default. If less than 5 characters, the remainder of the parameter should be filled with “@” characters (set bits to 0); but, not shown on the presentation. |
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Search Point |
Longitude |
28 |
Longitude in 1/10,000 minute. (±180°) East = positive (as per 2’s complement); West = negative (as per 2’s complement); 181° = not available = default. |
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Latitude |
27 |
Latitude in 1/10,000 minute (±90°) North = positive (as per 2’s complement); South = negative (as per 2’s complement); 91° = not available = default. |
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Search Altitude |
7 |
Altitude for search pattern in 50 ft increments. 0 = sea level; 50 – 6000 ft; 121 = not specified = default; 122 – 127 = reserved. |
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Search Speed |
9 |
Speed to execute the search pattern in 1kt increments. 0 = not specified = default; 1 – 500 kts; 501 – 510 = reserved; 511 – not to be used. |
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Spare |
1 |
Set to zero. |
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Total bits |
232 |
2 Slot Binary Message |
Unencrypted SAR Trackline Report Segment 2-32 (Message 8, Broadcast)
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Parameter |
# of Bits |
Description |
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Standard Message Header |
Message ID |
6 |
Identifier for Message 8; always 8. |
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Repeat Indicator |
2 |
Indicates how many times a message has been repeated. 0 – 3; 0 = default; 3 = do not repeat any more. Set to zero (default). |
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Source MMSI |
30 |
MMSI number of source station. Varies according to the transmitter ID. |
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Spare |
2 |
Not used. Set to zero. |
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Binary Data |
Designated Area Code |
10 |
Designated area code (DAC). This code is based on the maritime identification digits (MID). Set to 366. |
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Function Identifier |
6 |
Function identifier. Set to 16. |
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Application Data (unencrypted) |
Version |
3 |
Sequential number used to indicate the message version in steps of 1. 0 = test message = default; 1 – 7 = message version. Set to zero. |
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Message Linkage ID |
10 |
Identifier for the SAR Pattern Report. This number uniquely identifies a search pattern sent from a given SMC (MMSI) and is used to connect additional information with the search. Source MMSI and this ID uniquely identify the event. Set to 0-1023 by message originator; 0 = not available. |
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Message Segment |
5 |
Number of this message segment; sequential number. Recipient will need to receive all segments and put in order sequentially. 1 – 31. |
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Binary Data |
Application Data (unencrypted) |
Number of Segments |
5 |
Total number of segments comprising the complete Trackline Report (Total = N+1). N = 0- 31. |
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Search Point |
Longitude |
28 |
Longitude in 1/10,000 minute. (±180°) East = positive (as per 2’s complement); West = negative (as per 2’s complement); 181° = not available = default. |
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Latitude |
27 |
Latitude in 1/10,000 minute (±90°) North = positive (as per 2’s complement); South = negative (as per 2’s complement); 91° = not available = default. |
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Search Altitude |
7 |
Altitude for search pattern in 50 ft increments. 0 = sea level; 50 – 6000 ft; 121 = not specified = default; 122 – 127 = reserved. |
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Search Speed |
9 |
Speed to execute the search pattern in 1kt increments. 0 = not specified = default; 1 – 500 kts; 501 – 510 = reserved; 511 – not to be used. |
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Spare |
2 |
Set to zero. |
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Total bits |
152 |
1 Slot Binary Message |