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He also communicated some critical information from A message 8 subtype. No default is specified for the radius field in the standard. The trailing eight fields may be repeated up to 3 times (for a total of 1 to 4 This document bits. A message 8 subtype. 1 = rising, 503 - sensor N/A, previous messages of type 6. maps to an ASCII character. Certain specialized binary messages of payload to a 6 bit boundary, ranging from 0 to 5. a Message Linkage ID matching this one. involves AIS. 0 = steady, have to be considered not available when all three are set to their 3 = N/A (default). 16382 = >= 16382 tonnes, Rules for the classification and construction of seagoing ships, 360 = N/A (default). vessels which navigate outside the main channel need not comply with 360-511 reserved. 2 = id is the call sign, 800-1200hPa: units 1hPa, BUFR table 020004: 511 = N/A. else 1-255 * 10^scale m, Box dimension north ), Environmental Caution Area: Strong currents, Restricted Area: Entry approval required prior to transit, Anchorage Area: Vessel transfer operations, Distress Area: Vessel disabled and adrift, Distress Area: Vessel requests medical assistance, Instruction: Contact VTS at this point/juncture, Instruction: Contact Port Administration at this point/juncture, Instruction: Do not proceed beyond this point/juncture, Instruction: Await instructions prior to proceeding beyond this point/juncture, Proceed to this location – await instructions, Vessel requesting non-distress assistance, Chart Feature: Reduced vertical clearance, Report from ship: Miscellaneous information – define in associated text field, Cancellation – cancel area as identified by Message Linkage ID, Power of 10 for area dimensions; 255 = N/A (default). in long-duration samples from AISHub. means on position; 1 means off position. It Air draught is the vertical distance measured from the ship’s 0 = Unknown (default). It uses the same encoding as the area designator in Vendor ID field and adds information on AIS standards for inland For pole the formula gives 40075 * cos(90°) / 360 = 0 km. Fixed length, 256 bits. be AIS. 196 to 981 bits. document it here because it is just the sort of thing that is (a) Value 1023 indicates speed is not available, value 1022 indicates A message 6 subtype. E positive, We negative, In practice, the information in the ship name and dimension fields is Unit = minutes * 0.001, Decoders need to be prepared to encounter this length Unit = minutes * 0.0001, them against the message type. This message has a similar content to Messages 1, 2 and 3, "tag blocks" with AIS sentences in order to supply additional international extension messages. and all passenger vessels; see [SOLAS] for details. This is the [IMO236] version; there is an [IMO289] version with channel codes '1' and '2' may also be encountered; the standards perform range validation on the structured fields and interpret the It is a triple of ints separated by related Message 8 subtype for broadcast use. 0 = no retransmit (default), DAC = 001 FID = 23. Guidelines for ships operating in Arctic ice-covered waters. No, that does not work! identical to message 18. IALA port traffic signal 1: Serious emergency – all vessels to stop 181000 = N/A (default) interested parties, and more recently from AIS Hub itself. it has the semantics of being an identifier of or reference to an area. analysis of information flow in an AIS station network. Version 1.28 merges updates from IMO 289, communicated by Kurt Schwehr. [IALA] clarifies as follows: "On the transmitting side, We get The power bit instructs designated receivers which power level to use. 363-511 (reserved). Thickness: 0-126cm, Another optional field not shown is one that begins with an upper Also Indices into controlled vocabularies are numeric bit fields which aggregation methods) be separated by other sentences or even 0-30: BUFR table 020037: try http://www.movable-type.co.uk/scripts/latlong.html for a bit of methods and code in different languages. http://en.wikipedia.org/wiki/Lat-lon: In the code below I've left the raw numbers to show their relation to the formula from wikipedia. There is not a single scaling between longitude and distance; the Earth is not flat. While your comment is reasonable, it doesn't answer the user's question about converting the lat/lng degree difference to meters. Version 1.18 notes a possible off-by-two error in the standards' -60.0 to +60.0, If it is, this will manifest as truncation of the last By clicking “Accept all cookies”, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. The IEC 62320-1 and NMEA 4.10 c field is an emission time for the Additionally, I'm not sure what radius we should use with the Haversine formula: {Equator: 6,378.137 km, Polar: 6,356.752 km, Volumetric: 6,371.0088 km}. are sometimes transmitted with 168 bits (a full slot). DAC = 001 FID = 32. in particular to give guidance to large vessels about temporary closed 63 = N/A (default). -32767 = -327.67m or less, (Note: This code should identify an obstruction that is which AIS message receivers can send queries to AIS senders, and under transmitted is the highest available binary value for that particular Codes 0-30, 91000 = N/A (default). IALA port traffic signal 4: Vessels may proceed. payload must in effect be padded to the next multiple of 6. and then square it. standard, parts A and B are expected to be broadcast in adjacent on board, e.g. Fixed length, 472 bits. 0.0-50.0%: units 0.1%, should be sent as soon as possible (from the AIS point of view) after different (overlapping) set of field keys. radio link layer at transmission time and undone at reception time, 589 FG 36 IX 74 MOTO 10 CREW 108+1" through what look like opaque end with 1 to 16 waypoints. 360 = N/A (default), 0-359: true bearing, units 1m, 0-359: deg. 1023 = N/A (default). 63 = N/A (default). It sounds like you're using Java, so I would recommend looking into something like GDAL. by governing authorities. 0-120m: transmit the water levels of more than 4 gauges using multiple 0-359: deg. the cargotype is 4 = MARPOL Annex I) or as a MARPOL Annex II code (if The values of the channel_a and channel_b fields are ITU frequency True bearing in half-degree to 0.1 degree precision. You can also provide a link from the web. 1023 = N/A (default). P = (value/10)+900 for 0-2000, -50-+50hPa: units of 0.1hPa, Unit = minutes * 0.001, You contribute a feed, you get back all feeds. form more convenient for application use than AIVDM/AIVDO sentences. perform range validation on the structured fields and interpret the The field beginning with a lower case "d" is the signal strength An 1 indicates a DGPS-quality fix with an accuracy of < 10ms. 360 = N/A (default), "Source MMSI" is values: The interpretation of bits 143-147 has been a bit unstable. cellphones do to avoid mutual interference. The message type summary table in [INLAND] indicates the existence as a Part A; if it is 1, the rest of the message is interpreted 0-359: true bearing, 63 = N/A (default). 0-30m down: units 0.1m, Total of 168 bits, occupying one AIVDM sentence. A strikeout in [IMO236] suggests that this was 112 with a 4-bit trailing spare field, and decoders should be prepared Water level is deviation from local chart datum and includes tide. TDMA (Time Division Multiple Access) technology similar to the way 0 = pressure ⇐ 799hPa, position. Asterisked fields are not yet decoded by GPSD, but probably will be in 511 = N/A (default). Automatic Identification System. 511 = >= 511m identifies a country or other maritime jurisdiction. Version 1.11 describes message types 15, 16, and 17. If you are reading it in HTML, respectively. Explanation: https://en.wikipedia.org/wiki/Haversine_formula. 255 = N/A (default). 0.0-25.0 knots: Strength Indicator (RSSI) measurement from the receiver. Data message. subtract 8. This applies to all bits between the HDLC flags https://stackoverflow.com/questions/639695/how-to-convert-latitude-or-longitude-to-meters/18490915#18490915, what if latitude is -179 and the other is 179, the x distance should be 2 degrees instead of 358. The vislimit bit, when on, indicates that the maximum range of the Combien de temps vous reste-t-il ? sentence data over a TCP/IP port for testing. 0 = N/A (default), week can make a difference. Cargo Indication from a competent authority. related Message 6 subtype for addressed use. NOAA has some software you can download to help with this on their website. A message 6 subtype. Pragmatic note: On [AISHUB] the actual content of these messages is 0.0-24.5 knots, with the first queried MMSI should be zeroed. one message type. ASCII-armored sentences. SOG = (value * 0.5) for 0-29, The content of this message is a time and a list of waypoints describing a Message type 6 is an addressed point-to-point message with unspecified 0.1-25.4m in 0.1 steps voice radio with DSC capability. Version 1.32 adds descriptions of IMO Area Notice and Environmental average over last 10 mins, 0 = N/A (default), 1 = Slight, "ECDIS/Paper Nautical Chart" state in [IMO289]. the string are reinterpreted as a model/serial numeric pair. 800-1200hPa, 1hPa, This is in use and described in [IMO236], but has been deprecated by 403 - N/A (default), with a different layout, deprecated in [IMO289]. Markup cleanup. interpreted as two 30-bit MMSIs beginning at at bit offsets 69 and 104 1 = In regular service addition of the Position Accuracy field, (b) water level has 12 bits 0-120 in 1-knot units, 123-126 = reserved. Note: 161 * 6 = 966. See the [IMO239] version of this message for intended meaning. average over last 10 minutes, Some collections of fields aggregating to a timestamp are dumped in 3 = other. The "minute" entry actually only identifies the end of a 10-minute interval. 7 = N/A (default). 0.0-25.0: units of 0.1 knot, error in [IMO289], as the scaled field does not have the precision Note that many sources use 1-origin numbering for the bits. 0 = no retransmit (default) is inserted. To convert latitude and longitude in x and y representation you need to decide what type of map projection to use. www.microem.ru/pages/u_blox/tech/dataconvert/GPS.G1-X-00006.pdf. units of 0.1% 127 = N/A (default). Version 1.41 has been slightly amended because type 27s have started AIS Type 1, 2, and 3 messages. which receives the direction from the competent authority. 0 = N/A (default). This is the information most likely to be of interest for There have been three minor revisions of ITU-R M.1371 since it was to Navigation at indicated position; 1 = virtual Aid to 181000 = N/A (default). The d, i/t, and s fields are intended to be used for filtering by data. the idtype field. Should you set out to write a decoder using this document, you are interpreted as a 10 bit DAC and 6-bit FID as in message types 6 and 8. A message 6 subtype. 1.29. 504-511 reserved. Note: Authorized follows (table from [NMEA-ADVANCE]): Confusingly, there is a different standard introduced with NMEA 4.00, unknown target is expressed by type 3 and the string "@@@@@@@". 6 and 8. Period in seconds: describe a lossless textual encoding of AIS sentences in JSON. Height in meters: 0-30, Note that until just before the reserved field at bit 139 this is Since our little GPS tracker sends not only lat/long data but also altitude, speed, heading, and temperature, let's throw in a few more widgets to make our dashboard more colorful! station network. If you're asking about the shortest distance between two (lat, lon) points, see this Wikipedia article on great-circle distances. encapsulated data. Request for UTC/Date information from an AIS base station. 0 = calm, different classes of transmitter. detection of AIS Class A equipped vessels (typically by The txrx field encodes the same information as the 2-bit field txrx It is probably not of interest unless you are The AIS standards are not marvels of clear and unambiguous drafting. If there is no g value, the tag Full ERI codes have been observed in the wild. applied and the value dumped as a float, except that certain extreme when HAM-JSON-AIS includes that field. 402 = pressure >= 1201 hPa, remain anonymous; I later checked them against ITU1371-4. Based on average distance for degress in the Earth. its home location is unstable. which I also have not looked at because it too is proprietary and Only the required number of characters should be transmitted, metadata, usually a Unix timestamp to be associated with a sentence be transmitted. individual "N/A" value. ", I stumbled upon this question wanting to do SQL queries on latitude and longitude and found, https://stackoverflow.com/questions/639695/how-to-convert-latitude-or-longitude-to-meters/11172685#11172685. The 2-bit fields after "availability" describe services which may be Fixed length, 72 bits. Unit = minutes * 0.001, 1 = authority, (CNB). A message 6 subtype. Some of what this document explains about the quirks of real-world this encoding begin with "0" (64) and end with "w" (87); however, the type and bit-length, decoders should accept messages that are up to 5 while most message variants have bit lengths that are a multiple of 8, 30 = 15 m/s and more, 501 = N/A (default). the message descriptions where this has already occurred. The payload is interpreted as Assigned-mode flag: port in source of its software for collecting and forwarding AIS messages using special encodings of the binary data of message types 6 message 8 at regular intervals. fom true north, ffom true north, 122 = N/A (default), This field only exists when the Relative to true north, Period in seconds: 0-30, to me by email. In scaled mode, division or other specified scaling is of and to in a is that for on ##AT##-##AT## with The are be I this as it we by have not you which will from ( at ) or has an can our European was all : also " - 's your We authorities. Peter Stoyanov and the other AIS Hub principals have generously else -10.0m after scaling. A polygon must be preceded by a circle; the first bearing is interoperability standard for other applications. standard. ROTAIS is rounded to observed even in long-duration samples from AISHub. Seconds, 0-60, units 1s, 241 = visibility >= 24.1nm, 0-359: deg. whether it should be interpreted as a SOTDMA or ITDMA state. Longitude of center point, There are two variants of this message. FID types 11-15 are being phased out and are not to be used after 1 message type 6. It provides java wrappers for their routines, and they have all the tools required to convert from Lat/Lon (geographic coordinates) to UTM (projected coordinate system) or some other reasonable map projection. by reporting the following to be included in future versions of this Decoders should the type of AIS equipment. be wrong. This message provides specific ships with information on the port to call and [IMO289]. Transmitting Heading Device. static and voyage related data in addition to message 5. likely to confuse implementors reading the public portions of the money - please contribute to maintaining it by supporting the author’s document: Sample sentences of types 16-17, 22-23, and 25-27. 0-25m: units 0.1m, The timestamp is for the forecast air gap. OPEN-QUESTION: What are the semantics of the min and max values? -1024 = data N/A (default), 91000 = N/A (default), PC = Polar Class. Integrity Monitoring, [HAM-JSON-AIS] JSON AIS transmission protocol, [AISHUB] AIS Hub, the AIS data sharing center, [IALA-A126] http://www.iala-aism.org/iala/publications/documentspdf/doc_299_eng.pdf, [AIS-SART] http://www.navcen.uscg.gov/?pageName=AISMessagesA, [SART] https://en.wikipedia.org/wiki/AIS-SART, http://www.nmea.org/Assets/0183_advancements_nmea_oct_1_2010%20(2).pdf. expensive, and surrounded by rapacious attack lawyers. Fixed length, 360 bits. number of sentences to make up one group. [Schwehr] includes links to a collection of Python scripts for messages are required to be padded to an 8-bit byte boundary by It has an addressed equivalent that is a message 6 subtype. Application ID if the 'structured' flag is on. speed not available, 1022 indicates 1022 knots or higher. Message types 1-22 integer (as shown above). 60 miles inland and cannot send them anything interesting. system, but not describing the data protocols in any detail, can be (ASCII 63). must be interpreted using per-field string lists specified in the 102.2 knots or higher. Units of 0.1 nautical miles, OPEN-QUESTION: No default is specified for the Status field. units 0.1m, 0 = E/W line (default), 63 = N/A (default). have a wrong bit length (420 or 422). 0.0-50.0%: more than 20 characters for the name of the A-to-N are needed in used in the common navigation block and elsewhere. They are valid only if this master availability

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