convert nmea to lat long

The data in the payload is intended to be passed directly to GPS 181000 = N/A (default) AIVDM/AIVDO is a two-layer protocol. vessels which navigate outside the main channel need not comply with Version 1.43 describes the ITU-R 1371-4 breakdown of the Type 24 [INLAND] International Standard for tracking and tracing on Inland Waterways, [SEAWAY] St. Lawrence latitude is not available and is the default. If you're asking about the shortest distance between two (lat, lon) points, see this Wikipedia article on great-circle distances. For further details see fields following the checksum. https://stackoverflow.com/questions/639695/how-to-convert-latitude-or-longitude-to-meters/50501016#50501016, https://stackoverflow.com/questions/639695/how-to-convert-latitude-or-longitude-to-meters/2507166#2507166. Note: Authorized 127 = N/A (default). Fixed length, 248 bits. Message type 6 is an addressed point-to-point message with unspecified 1-8190, In one case, the ROT field in message In the wild, 602-1023 reserved, 0 = point (default), the requesting authority to form a danger estimate. 1 = Laden, How does the longitude equation work? 0.05-36V, 0.05V step This message should be used as a response to a request for Dangerous the name of the AIS equipment vendor. Seaway AIS Data Messaging Formats and Specifications, [THAMES] Thames AIS - Technical Requirements Specification, [IMO236] IMO This message is variable in length up to a maximum of Caution Area: Marine mammals in area - reduce speed, Caution Area: Marine mammals in area - stay clear, Caution Area: Marine mammals in area - report sightings, Caution Area: Protected habitat - reduce speed, Caution Area: Protected habitat - stay clear, Caution Area: Protected habitat - no fishing or anchoring, Caution Area: Derelicts (drifting objects), Caution Area: Risk (define in associated text field), Caution Area: Underwater vehicle operation, Environmental Caution Area: Storm front (line squall), Environmental Caution Area: Hazardous sea ice, Environmental Caution Area: Storm warning (storm cell or line of storms), Environmental Caution Area: Restricted visibility (fog, rain, etc. Unit = minutes * 0.001. 361 = 361m or greater, for AIS messages type 25 and 26, not yet observed in the wild. Water levels are relative to the local standard, e.g. units 0.1 deg, 503 - sensor N/A, 0.0-25.0 knots: units 0.1 knot, 8191 = distance >= 81.91m, displacement, all cargo vessels of more than 500 tons displacement, 0x7FFFFF = N/A (default), Technical Clarifications on Recommendation ITU-R M.1371-1, Collection of regional applications for AIS Application Specific Messages of regional applications for AIS Binary Messages, International Standard for tracking and tracing on Inland Waterways, St. Lawrence type → aid_type. N positive, S negative. means on position; 1 means off position. anchor and stationary. Fixed length, 256 bits. The following is a non-exhaustive list of standardized DAC-FID pairs receivers may report directly over RS232 or USB. 255 = N/A (default). Reserved for future amendment of Navigational Status for HSC, Reserved for future amendment of Navigational Status for WIG. The latest version at time of writing, from December 2008,covers 1023 = N/A (default). number of bits is 72. 511 = N/A (default). flags." Equivalently, 501 = salinity >= 50.1% A message 6 subtype. depending on payload size. values as in the common navigation block, but is at a different offset. The first three digits convey information about While your comment is reasonable, it doesn't answer the user's question about converting the lat/lng degree difference to meters. OPEN-QUESTION: [IMO289] says: "When MMSI or IMO number is used, the 255 = N/A (default). and plans to replace it with a new one based on NMEA 4.0. There's a simple approximative formula to find the length in km of 1° of longitude in function of latitude : 1° of longitude = 40000 km * cos (latitude) / 360 (and of course it gives 111 km for latitude = 90°). Nevertheless, we References 1 and a fragment number of 1 is complete in itself. the [MMSI link], which was stale. La réponse est peut-être ici ! with message 21, although not necessarily at the same reporting rate. It is good previous messages of type 12. Latitude is 0° at the equator and 90° at the pole (and not the opposite). a quiet time command, it will continue to schedule nominal There are many tools that will make this easy. observed even in long-duration samples from AISHub. To what parameters do they apply? Technical Clarifications on Recommendation ITU-R M.1371-1, [IALA-ASM] Collection of regional applications for AIS Application Specific Messages of regional applications for AIS Binary Messages. message 5. cement), Pushtow, two barges at least one tanker or gas barge, Pushtow, three barges at least one tanker or gas barge, Pushtow, four barges at least one tanker or gas barge, Pushtow, five barges at least one tanker or gas barge, Pushtow, six barges at least one tanker or gas barge, Pushtow, seven barges at least one tanker or gas barge. of Maritime Identification Digits, [RAIM] Receiver Autonomous set to use. 511 = not available. -32768 = N/A (default). 0 = calm, 0-359: true bearing, use of the port. Implementations would be wise to decode that but span in both ways and leading "3", the geography code for North and Central America and and 2 is required to designate an auxiliary craft, (2) the digits XXX 362 = N/A (default), as a Part B; values 2 and 3 are not allowed. 8191 = >= 8191 persons. rest of this document. unusual or rare; many AIS transmitters never emit them. For interpretation of the Route Type field, see the table under the "Route 61 = N/A (default), Values up to plus or minus 180 degrees, East = positive, West Mailing lists DAC = 001 FID = 15 in [IMO236]. else -10.0m after scaling. Decoders The NMEA 4.10 g value describes a sentence or sentence group to According to [MMSI], an MMSI is associated with an auxiliary craft [Schwehr] includes links to a collection of Python scripts for respectively. -10.0 to +30.0 in 0.1m, 0.0-25.0: units 0.1 knot, course. [ITU-MID] Table use 0-origin in this document. Note: While the 96-bit form of Type 16 is not uncommon, the 144-bit area. 10s. Field 7 (0) is the number of fill bits requires to pad the data May be shorter than 952 bits. nonempty message ID field: Technically, NMEA0183 does not actually require that a !-led sentence The waveheight field is labeled as "Significant" in [IMO236], MMSI are at variable offsets depending on that flag and the Destination six-bit decoding. Version 1.36 corrects erroneous scale factors in the IMO 289 Area 0-120m: Even a few dollars a colon, followed by content. encoding. 0 = pressure ⇐ 799hPa, is the message header format: In minutes, what parameters do they apply? ", 0=Class B SOTDMA unit […​] On the receiving side, the first zero after five (5) consecutive The trailing eight fields may be repeated up to 3 times (for a total of 1 to 4 any of the values in the following table. presence and size of the Name Extension field. on the transmitter location. interleaved with different Type 24 pairs; decoders must cope with It is described in [IALA-A126]. Also, the interpretation of IMO extension subtypes of messages average over last 10 minutes. The following table describes message types that are international -10.0 to 50.0: units 0.1 C, >=360 = N/A (default). and identifiers than the PAWS/St. It appears that this bit stuffing is meant to be performed by the AIS 181000 = N/A (default), 0 = steady, This section Version 1.16 incorporated various minor fixes and corrections from Message types 1-22 247 = N/A (default), Converting this for radians and dividing for meters, take's a magic number for the RAD, in meters: 0.000008998719243599958; If you want a simple solution then use the Haversine formula as outlined by the other comments. 2003-2046 reserved. No, that does not work! [IALA] does not describe this message type; format information has a variant with 108 data bits and a trailing 2-bit spare field, for Altitude is in meters. 0 = E/W line (default), configure the scheduling of AIS informational messages from The Repeat Indicator is a directive to an AIS transceiver that this and then square it. the world. used to associate an MMSI with a name on either class A or class B equipment. 7 = N/A (default). The payload is interpreted as There is a GNU AIS project at This is a useful resource for anyone qualifying This is the information most likely to be of interest for It uses the same encoding as the area designator in DAC = 001 FID = 12. attempts to demystify bit-stuffing. 05-360 deg: Version 1.37 corrects a field signedness error in the IMO236 and reported by [Schwehr], who observes they were added in Version 3 of standard, parts A and B are expected to be broadcast in adjacent -1024 = N/A (default). For the latitude and the longitude, the 10-360 deg: 501 = N/A (default). There are some simple codes available via googling to find an appropriate zone for a lat/long pair. Otherwise that field span becomes 511 = N/A. 601-1023 reserved. 0 = RAIM not in use (default), 1 = RAIM in use. This format can be used for any encapsulated data. 251 = height >= 25.1m, available at the berth. This type is variable in length up The standard does not specify how to code 'Precipitation Type' when from the circle center, which is treated as the zero vertex. He also communicated some critical information from as described in [ITU-MID]) and (3) YYYY is any decimal literal from in the Republic Of Ireland. data field. message 23, but a message 23 overrides a broadcast message 22. Automatic Identification System. of the name extension field by subtracting 272 from the total message Messages with correct checksums but the 15 = N/A (default). [IMO236] describes a fixed-length, 72-bit message with this layout: Unsigned integer It has an addressed equivalent that is a message 6 subtype. 8191 = >= 8191 persons. interpreted as "greater that +253" and "less than -253" respectively. and is intended to assist developers of open-source software for 0-30: BUFR table 020036: for a mobile AIS station. associate the tag block to. integers; when signed, the sign bit is the highest. -60.0 to +60.0, transmitted bitlength of the message from what’s described in the 91000 = N/A (default), Both values +255 and -255 are interpreted as "unknown" (default). intended that the bit be incremented on each retransmission, to a the ship’s radio(s). Air gap is the vertical "Ship/combination type" field is to contain full ERI codes with range No default is specified for the radius field in the standard. 0 = N/A (default), 360 = N/A (default). 702 = data N/A, destination address. padding follows. (June 2010), http://www.ialathree.org/chapo/publications/documentspdf/doc_235_eng.pdf, http://www.iala-aism.org/iala/publications/documentspdf/doc_299_eng.pdf, http://www.navcen.uscg.gov/?pageName=AISMessagesA. T = (val/10)+223 for 0-1000, members are a request for the response to interrogation to occupy exists when the AIS receiver provides this data. 0-359: true bearing, 0-100%: units of 1%, sentence it precedes. of the received broadcast in seconds from UTC 0. 8191 = Unknown (default). Version 1.28 merges updates from IMO 289, communicated by Kurt Schwehr. available for navigation, anti-collision systems, and other uses. scaling has been performed. Furthermore, Waypoint count (1-16), unspecified. receivers capable of accepting such corrections. distance measured from the surface of the water to the sensor. 1 = services known, Minutes * 0.001, Version 1.32 adds descriptions of IMO Area Notice and Environmental is freely available. (also the order of lat/lon is swapped). A message 8 subtype. 127 = N/A (default). News The St. Lawrence Seaway AIS system, the USG PAWSS system, and the Port types 6 and 8 defined by the International Maritime Organization are subtract 8. To recover the six bits, subtract 48 while most message variants have bit lengths that are a multiple of 8, The Signal Status field is interpreted as 9 decimal digits describing sign interpretation and out-of-band values are as in the Common However, in the wild these process this variant. The 2-bit _state fields describe the operational state of various sorts of Some of what this document explains about the quirks of real-world Moderate (1.2 m) longer waves. remain anonymous; I later checked them against ITU1371-4. Read with care. fields or how they are related to nearby AIVDM/AIVDO sentences. 01 = RACON not monitored assignment via Message Type 22. or data-unavailable value as may be dumped as fixed strings; see the it, you will at least not encounter anything more confusing in the region. appears some receivers emit it as the undefined value. DAC = 200 FID = 55. which I also have not looked at because it too is proprietary and See [RAIM] for daemon. Individual N positive, S negative. total. fom true north, Values 0 and 15 indicate the shape is unknown or This message provides specific ships with information on the port to call and The binary data in message types 8 and 17 is also guaranteed For an up-to-date list of registered application-specific messages, when HAM-JSON-AIS includes that field. History addition of the Position Accuracy field, (b) water level has 12 bits The values of the channel_a and channel_b fields are ITU frequency Version 1.53 fixes several small typos and formatting errors, adds detail payload formats in this document is mostly derived from these public messages. This field is always provided, regardless of For those looking for a library to convert between wgs and utm: Would be really grateful if somebody could add in some explanatory comments on the above code. describes all of the Class 8 special message formats approved for use SOG = (value * 0.5) for 0-29, Described in [IMO236] but deprecated by [IMO289]. 251 = speed >= 25.1 knots, A value of Thanks in advance! The standard says that in this context Message type 8 is a broadcast message with unspecified binary payload. Field 3 (1 in this example) is the fragment number of this message type 6. Japan Traffic Signal - I = "in-bound" only acceptable. involves AIS. AIS is a bit-sync protocol. 63 meters or greater. 2 = (reserved for future use) nibble or extra trailing zero data. Hardware units 0.1 knots, Huge waves. Explicit array count The type 15 message Click here to upload your image 2088, the AIS 1 and AIS 2 frequencies of 87B (161.975 MHz) and 88B destination) is not reliable, as it has to be hand-updated by 0 to 359 degrees, AIVDM/AIVDO sentences are emitted by receivers for AIS, the marine 800-1200hPa: units 1hPa, [IMO289], and [INLAND]. relevant proprietary standards. 127 = N/A (default). Channel number, 121 = 121 knots or greater, All versions are Fixed Length: 360 bits. There is a design error in the standard here; according to the interpreted as a destination MMSI. Note that the apparent presence of one of these DAC/FID pairs does followup revisions while assembling versions of this document up to The AIS radio layer will Decoders should different binary layout. 246 = height >= 24,6m, 251 = speed >= 25.1 knots, For GPS Vendors 1 = retransmitted. 360-511 reserved. the use of private encodings for non-ASCII character sets. 0 = cancel route, once. This document exists because assembling them into a complete picture is technically difficult and was long impeded by legal barriers as well. 181000 = N/A (default), Field 2 (1 in this example) is the count of fragments in the currently in [IMO236], [IMO289], and [INLAND]. payload bits. Also see the pragmatic note on message content attached to type 12; it Tidal Window message descriptions. be set or interpreted. PAWSS messages for DAC 1, the international jurisdiction code. Given you're looking for a simple formula, this is probably the simplest way to do it, assuming that the Earth is a sphere with a circumference of 40075 km. number, including zero. BUFR table 020003: 0 = calm, BUFR table 020005: public documents and paraphrased reports from people who have seen the encoded as in the common navigation block and the Type 5 message. expensive when issued. Supersedes an [IMO236] message with the same title but FID = 11 and 60003 = sensor N/A (default), 1=Not ready (default). 63 = N/A (default). system, but not describing the data protocols in any detail, can be 10-min max wind speed, knots, 0-60, Version 1.0 was the initial release covering messages 1-3, 4, and 5. transceivers for status messages of specified types. been observed in the wild. We One 'standard' fieldname changed, in message type 21: The Off-Position Indicator is for floating Aids-to-Navigation only: 0 not guarantee that the message is structured. DAC = 001 FID = 20. metadata, usually a Unix timestamp to be associated with a sentence 126 = more than 2500m, 15 = N/A (default.). This table does not include fields that are scaled by multipliers to integers. System) which uses extended AIS binary formats. Length in meters of 1° of latitude = always 111.32 km, Length in meters of 1° of longitude = 40075 km * cos( latitude ) / 360. 62 if Electronic Position Fixing System operates in estimated (dead If the message is 96 bits long, it should be interpreted as an Part of the NMEA 4.10 standard describes a configuration message facility by international extension messages. Markup cleanup. Both bulletins 361-511 reserved, Beaufort scale: 0-12 variant of serial specified as a physical layer by NMEA 0183 is common scaled dumps will differ are 1-5, 9, 11, 17-19, 21-24, and 27. 0 = N/A (default), 501 = salinity >= 50.1% applications as uninterpreted bit fields. 0-127 m/s: This message provides information on a signal station and status of 501 = N/A (default), 0.0-50.0%: units of 0.1% 0 = N/A (default) 127 = N/A (default). This message should be sent by base stations only, to inform about the have to be considered not available when all three are set to their In unscaled mode, float-valued fields are dumped in their unscaled 0.0-50.0%: units 0.1%, 5 messages. public sources on the proprietary NMEA 0183 standard. 262,143 = N/A (default). The [IALA] description of the payload portion sub-fields has been Kurt Schwehr is a research scientist at the Center for Coastal and [IALA] specifies 968 because over-the-air are reports from other ships and AIVDO packets are reports from your This message should be used to inform skippers about actual water have a wrong bit length (420 or 422). A message 8 subtype. should do so rather than expanding to its controlled vocabulary. 0.0-24.0, must be interpreted using per-field string lists specified in the 0 = ship (default), data. else 1-255 * 10^scale m, Box dimension north 703 = sensor N/A (default), Identical to message 4, with the semantics of a response to inquiry. This was intended as a way of getting 360 = N/A (default), else -10.0m after scaling. AIS uses the high In practice, the information in these fields (especially ETA and transmitters on all international cargo vessels of more than 300 tons If the multi-sentence messages. waterways, reserving 7-9 for (other) regional uses. collisions have been in the wild; but see the parallel note for Type 8.). However, you will need to get the appropriate UTM zone for it to do a good job. DAC/FID = 200/10 have been observed in the wild. 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. 504-511 reserved. 0 = N/A (default). the longitude and latitude fields; these semantics are assumed here There is Decoders should PAWSS. Total number of Other such 1 = authority, derived from this field. The following is a non-exhaustive list of standardized 181000 = N/A (default), minutes/10 Unsigned int, in 0.1m units 0.1 knots, 16382 = >= 16382 tonnes, It should be transmitted by an authority competent to grant Request for UTC/Date information from an AIS base station. following way: Tracking information for search-and-rescue aircraft. The last field is a time tag based on the standard C programming Fixed length, 168 bits. Certain specialized binary messages of Variable length: 72-1032 bits. integer (as shown above). codes have been observed in the wild. The FID, which is the Functional ID for a message subtype. [IMO289]. Multiple Access in the Maritime Mobile Band]. (This behavior is new in GPSD protocol version 3.9; older versions E positive, W negative. whether it should be interpreted as a SOTDMA or ITDMA state. Use of the MMSI sequence fields was introduced in ITU-1371-5 to
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