Virtual ATON
This VDE Protocol Format may be used to distribute one or multiple Virtual AtoN to be output by the equipment via legacy PI VDL sentences to be able the use of the enhanced capacity of VDE-TER and VDE-SAT in combination with legacy application equipment connected to the PI interface
IALA
G1117-Ed3.0-VHF-Data-Exchange-System-VDES-Overview
Parameter |
Number of bits |
Description |
---|---|---|
VPFI |
16 |
2 |
Message ID |
16 |
3 |
Source ID |
30 |
Identity of the virtual AtoN station (see Article 19 of the RR and Recommendation ITU R M.585) |
Type of aidsto-navigation |
5 |
0 = not available = default; refer to appropriate definition set up by IALA; |
Longitude |
28 |
Longitude in 1/10 000 min of position of an AtoN (±180°, East = positive, West = negative 181 = (6791AC0h) = not available = default |
Latitude |
27 |
Latitude in 1/10 000 min of an AtoN (±90°, North = positive, South = negative 91 = (3412140h) = not available = default |
AtoN status |
8 |
Reserved for the indication of the AtoN status see, IALA Recommendation R-0126 00000000 = default |
Virtual AtoN flag |
1 |
0 = default = physical AtoN at indicated position; 1 = virtual AtoN, does not physically exist. |
Cancellation |
1 |
|
Name of Aidsto-Navigation |
6-204 |
Maximum 34 characters 6-bit ASCII “@@@@@@@@@@@@@@@@@@@@” = not Available = default.
|
Spare bits |
0-7 |
Spare, not used. Should be set to zero. Padding to ensure complete message is complete bytes |
Valid until |
32 |
Unsigned integer number of seconds after the 1st of January 1970 00:00:00 UTC. After the 19th of January 2038 03:14:07 UTC, the number is the number of seconds after this new date (wraps around); To avoid replay attacks, this value shall be used by the receiving application to verify the validity of the data together with the signature field. |
Signature |
512 |
Signature over above data, applied over all bits from the start of the VPI field to the end of the last bit, just before the signature, generated as described for the terrestrial bulletin board, see ITU-R M.2092-1, Annex 4, §4.15 |
Number of bits |
variable |
Does not include “Message ID” (the first parameter) |
Resulting PI-Port output
VDM encapsulating Message 21: Aids-to-navigation report:
Table 12 Virtual AtoN Message
Parameter |
Number of bits |
Description |
---|---|---|
Message ID |
6 |
Value: 21 Identifier for Message 21 |
Repeat indicator |
2 |
Value: TBD Used by the repeater to indicate how many times a message has been repeated. See § 4.6.1, Annex 2; 0-3; 0 = default; 3 = do not repeat any more 3 |
Source ID |
30 |
Value: As received Identity of the virtual ATON station (see Article 19 of the RR and Recommendation ITU R M.585) |
Type of aidsto-navigation |
5 |
Value: As received 0 = not available = default; refer to appropriate definition set up by IALA; see Table 13 |
Name of Aidsto-Navigation |
120 |
Value: As received in first 120 bits of corresponding Name field. Pad up to 120 bits if shorter (with zero). Maximum 20 characters 6-bit ASCII, as defined in Recommendation ITU-R M.1371-5 Table 47 “@@@@@@@@@@@@@@@@@@@@” = not available = default. The name of the AtoN may be extended by the parameter “Name of Aidto-Navigation Extension” below |
Position accuracy |
1 |
Value: 0 1 = high (≤10 m) 0 = low (>10 m) 0 = default The PA flag should be determined in accordance with Recommendation ITU-R M.1371-5 Table 50 |
Longitude |
28 |
Value: As received Longitude in 1/10 000 min of position of an AtoN (±180°, East = positive, West = negative 181 = (6791AC0h) = not available = default |
Latitude |
27 |
Value: As received Latitude in 1/10 000 min of an AtoN (±90°, North = positive, South = negative 91 = (3412140h) = not available = default |
Dimension/ reference for position |
30 |
Value: 0 Reference point for reported position; also indicates the dimension of an AtoN (m) (see Recommendation ITU-R M.1371-5 Fig. 41bis and § 3.19.1) |
Type of electronic position fixing device |
4 |
Value: 7 [0 = not available = default
|
Time stamp |
6 |
Value: 61 UTC second when the report was generated by the EPFS (0-59 or 60) if time stamp is not available, which should also be the default value or 61 if positioning system is in manual input mode or 62 if electronic position fixing system operates in estimated (dead reckoning) mode or 63 if the positioning system is inoperative) |
Off-position indicator |
1 |
Value: 0 For floating AtoN, only: 0 = on position; 1 = off position. This flag should only be considered if time stamp is equal to or below 59. For floating it denotes that the AtoN exceeds the zone parameters set for on station. |
AtoN status |
8 |
Value: As received Reserved for the indication of the AtoN status, refer to IALA R0126. 00000000 = default |
RAIM-flag |
1 |
Value: 0 RAIM (Receiver autonomous integrity monitoring) flag of electronic position fixing device; 0 = RAIM not in use = default; 1 = RAIM in use see ITU-R M.1371-5, Table 50 |
Virtual AtoN flag |
1 |
Value: As received 0 = default = physical AtoN at indicated position; 1 = virtual AtoN, does not physically exist. |
Assigned mode flag |
1 |
Value: 0
|
Spare |
1 |
Value: 0 Should be set to zero. Reserved for future use |
Name of Aid-to- Navigation Extension |
0, 6, 12, 18, 24, 30, 36, ... 84 |
Value: As received after first 120 bits of corresponding Name field. Excluded if Name is shorter. This parameter of up to 14 additional 6-bit-ASCII characters for a 2-slot message may be combined with the parameter “Name of Aid-to-Navigation” at the end of that parameter, when more than 20 characters are needed for the name of the AtoN. This parameter should be omitted when no more than 20 characters for the name of the A-to-N are needed in total. Only the required number of characters should be transmitted, i.e., no @-character should be used |
Spare |
0, 2, 4, or 6 |
Value: as required for byte alignment Used only when parameter “Name of Aid-to-Navigation Extension” is used. Should be set to zero. The number of spare bits should be adjusted in order to observe byte boundaries |
Number of bits |
272-360 |
|
Table 13 The nature and type of aids to navigation can be indicated with 32 different codes
Parameter |
Code |
Definition |
---|---|---|
|
0 |
Default, Type of AtoN not specified |
|
1 |
Reference point |
|
2 |
RACON or Mobile AtoN |
|
3 |
Fixed structures off-shore, such as oil platforms, wind farms. (NOTE 1 – This code should identify an obstruction that is fitted with an AtoN AIS station) |
|
4 |
Emergency Wreck Marking Buoy |
Fixed AtoN |
5 |
Light, without sectors |
|
6 |
Light, with sectors |
|
7 |
Leading Light Front |
|
8 |
Leading Light Rear |
|
9 |
Beacon, Cardinal N |
|
10 |
Beacon, Cardinal E |
|
11 |
Beacon, Cardinal S |
|
12 |
Beacon, Cardinal W |
|
13 |
Beacon, Port hand |
|
14 |
Beacon, Starboard hand |
|
15 |
Beacon, Preferred Channel port hand |
|
16 |
Beacon, Preferred Channel starboard hand |
|
17 |
Beacon, Isolated danger |
|
18 |
Beacon, Safe water |
|
19 |
Beacon, Special mark |
Floating AtoN |
20 |
Cardinal Mark N |
|
21 |
Cardinal Mark E |
|
22 |
Cardinal Mark S |
|
23 |
Cardinal Mark W |
|
24 |
Port hand Mark |
|
25 |
Starboard hand Mark |
|
26 |
Preferred Channel Port hand |
|
27 |
Preferred Channel Starboard hand |
|
28 |
Isolated danger |
|
29 |
Safe Water |
|
30 |
Special Mark |
|
31 |
AIS Mobile Marker used to mark vehicles, platforms, objects such as Light Vessel/LANBY/Mobile offshore drilling units/Rigs, unmanned autonomous vehicles, debris, etc. |
NOTE 1 – The types of aids to navigation listed above are based on the IALA Maritime Buoyage System, where applicable. NOTE 2 – There is potential for confusion when deciding whether an aid is lighted or unlighted. Competent authorities may wish to use the regional/local section of the message to indicate this.