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4896915
handle bsvdm
dakk Oct 27, 2025
df04387
fix aisparser
dakk Oct 27, 2025
f7614de
update compiled
dakk Oct 27, 2025
36dfdb2
add more prefixes
dakk Oct 27, 2025
cdcaea9
add b1vdm
dakk Oct 27, 2025
8fc2650
add anvdo
dakk Oct 27, 2025
0aa9daf
shrink start string checks
dakk Nov 8, 2025
7614685
add missing 374 as panama
dakk Nov 8, 2025
1ef5a7b
compile
dakk Nov 8, 2025
72156d0
add other ais message start types
dakk Nov 8, 2025
b3974f6
add more vdm and vdo messages
dakk Nov 8, 2025
806f864
Merge branch 'samothx:master' into master
dakk Nov 10, 2025
498f478
handle msg8dac1fid31
dakk Nov 16, 2025
018a430
improve testing
dakk Nov 16, 2025
dcd59fd
7msgdac1fid31 typing
dakk Nov 16, 2025
2eb2a1e
fix aisparser data decoding
dakk Nov 16, 2025
9c2b4cf
fix air pressure
dakk Nov 16, 2025
18d1ab9
handle dacc1 fid 30
dakk Nov 18, 2025
9cb06c0
handle dac1fid21 weatherreport
dakk Nov 19, 2025
1716f12
add more dac1 messages support
dakk Nov 19, 2025
37d0ce4
handle message 8 dac 367 fid 23
dakk Nov 19, 2025
9481403
handle 367 - 24
dakk Nov 19, 2025
5350d5d
fix coordinates in weather messages
dakk Nov 19, 2025
89b9d75
sar aicraft position report
dakk Jan 20, 2026
d80bb63
compile flow
dakk Jan 20, 2026
eaa4ac7
Merge pull request #1 from dakk/sar-aircraft-position
dakk Jan 20, 2026
81c9be6
add missing fields in SupportedValues
dakk Jan 20, 2026
b164875
integrate ci, license and readme badges
dakk Jan 20, 2026
918d559
fix ci install
dakk Jan 20, 2026
9741e6e
remove node 22 from ci, install jest
dakk Jan 20, 2026
784a4af
update all devdeps, add other node versions on ci
dakk Jan 20, 2026
369d759
build
dakk Jan 20, 2026
67a1a51
update package.json, bump version
dakk Jan 22, 2026
8d67b63
add contributing, minors on readme
dakk Jan 22, 2026
7a91e39
add npm badge on readme
dakk Jan 22, 2026
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4 changes: 2 additions & 2 deletions .babelrc
Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
{
"plugins": ["transform-flow-strip-types"],
"presets": ["env"]
"plugins": ["@babel/plugin-transform-flow-strip-types"],
"presets": ["@babel/preset-env"]
}
30 changes: 30 additions & 0 deletions .github/workflows/test.yml
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name: Tests

on:
push:
branches: [master]
pull_request:
branches: [master]

jobs:
test:
runs-on: ubuntu-latest

strategy:
matrix:
node-version: [18, 20, 22, 24]

steps:
- uses: actions/checkout@v4

- name: Use Node.js ${{ matrix.node-version }}
uses: actions/setup-node@v4
with:
node-version: ${{ matrix.node-version }}
cache: 'npm'

- name: Install dependencies
run: npm ci

- name: Run tests
run: npm test
3 changes: 3 additions & 0 deletions .vscode/settings.json
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@@ -0,0 +1,3 @@
{
"javascript.validate.enable": false
}
7 changes: 7 additions & 0 deletions CONTRIBUTING.md
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@@ -0,0 +1,7 @@
This library is written using [flow](https://flowtype.org/). It can be run from the src directory with babel-node or in the transpiled version from the index.js file or the lib directory. While using from github, you will need to take care of transpiling by calling the following commands:

```
cd <package-dir>
npm install
npm run-script transpile
```
201 changes: 201 additions & 0 deletions LICENSE
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@@ -0,0 +1,201 @@
Apache License
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18 changes: 11 additions & 7 deletions README.md
Original file line number Diff line number Diff line change
@@ -1,18 +1,21 @@
# AisParser

[![npm version](https://img.shields.io/npm/v/aisparser.svg)](https://www.npmjs.com/package/aisparser)
[![Tests](https://github.com/dakk/AisParser/actions/workflows/test.yml/badge.svg)](https://github.com/dakk/AisParser/actions/workflows/test.yml)
[![License](https://img.shields.io/badge/License-Apache_2.0-blue.svg)](https://opensource.org/licenses/Apache-2.0)

A Parser for NMEA0183 AIS messages.

## Installation
The parser is written using [flow](https://flowtype.org/). It can be run from the src directory with babel-node or in the transpiled version from the index.js file or the lib directory. If you are using the NPM package ( add "aisparser" :">=0.0.12" to your package.json dependencies) you do not have to worry about transpiling, it has been done for you allready. If you are using the github package you will need to take care of transpiling by calling the following commands:
```
cd <package-dir>
npm install
npm run-script transpile
```bash
npm i aisparser
```



## How it works
The modules approach to parsing AIS messages is 'on demand'. A message is merely stored and some basic checks are done by the **parse** function. When data is requested only as much of the message is parsed as is needed to decode the requested data. For instance when the aisType is read only one byte of the message is actually translated and parsed. So it makes sense to only read the values that are really needed. Although some common values are cached in the result object once they have been requested, most values are not - meaning that they are parsed every time they are requested.

The Module parses AIS messages of types 1,2,3,4,5,8,14,18,19,21 and 24. These are the common message types, most other types are related to inter vessel or vessel to shore communication.
The Module parses AIS messages of types 1,2,3,4,5,8,9,14,18,19,21,24 and 27. These are the common message types, most other types are related to inter vessel or vessel to shore communication.

Although the parser has been thoroughly checked against AIS logs from AISHub and AIS recordings from the Panama Canal, the author takes no responsibility for the correctness of returned values. Please always keep a good watch and an eye on the traffic while commanding a vessel.

Expand Down Expand Up @@ -112,6 +115,7 @@ After executing the command the file output1000.csv should contain comma separat
The last parameter delivers the type of data to be read. When set to sigk it will try to parse a format delivered by the signalk-node-server that puts a timestamp and a source tag in front of every line.

## Usage: (as in samples/Sample.js)

```javascript
var AisParser = require('../index');

Expand Down
24 changes: 15 additions & 9 deletions SupportedValues.md
Original file line number Diff line number Diff line change
Expand Up @@ -3,17 +3,17 @@
| Parameter | Type | Description |Values | Messages |
|:----------|:-----|:---------------------|:-----------|:---------|
|valid|string|Validity of the result|VALID, INVALID, UNSUPPORTED, INCOMPLETE|all|
|aisType|number|The message number of the AIS Message| 1-5, 18, 19, 21, or 24|all|
|aisType|number|The message number of the AIS Message| 1-5, 9, 18, 19, 21, or 24|all|
|channel|string|The VHF channel the message was Transmitted on |A,B or empty |all|
|repeatInd|number|Wether or not / how this message should be rebroadcasted | 0,1,2,3 |all|
|mmsi|number|Maritime Mobile Service Identity |9 digit number|all|
|midCountry|string|Country extracted from the MMSI|The Country or empty|all|
|midCountryIso|string|ISO String of the Country extracted from the MMSI|The ISO String or empty|all|
|mmsiType|string|The Type of Target extracted from the MMSI|Target type or empty|all|
|class |string|The Class of AIS Device | A, B empty | all |
|latitude| deg |The latitude of the Sender | -90-90 |1, 2, 3, 4, 18, 19|
|longitude| deg |The longitude of the Sender | -180-180 |1, 2, 3, 4, 18, 19|
|posAccuracy|boolean|Position Accuracy, true = DGPS Quality < 10m, false >10m|true,false|1, 2, 3, 4, 18, 19|
|latitude| deg |The latitude of the Sender | -90-90 |1, 2, 3, 4, 9, 18, 19|
|longitude| deg |The longitude of the Sender | -180-180 |1, 2, 3, 4, 9, 18, 19|
|posAccuracy|boolean|Position Accuracy, true = DGPS Quality < 10m, false >10m|true,false|1, 2, 3, 4, 9, 18, 19|
|navStatus|index|Navigational Status of AIS Target|0-15|1,2,3|
|navStatusStr|string|A String associated with Nav Status|-|1,2,3|
|utcYear|year|Message Type 4 Base Station Time Reference|1-999, 0=N/A|4|
Expand Down Expand Up @@ -45,11 +45,11 @@
|destination|string|Destination of Vessel|-|5|
|draught|m|Draught of Target|-|5|
|heading|deg|True Heading of Target|0-359|1, 2, 3, 18, 19|
|sog|kn|Speed over Ground|0-102.1|1, 2, 3, 18, 19|
|sogStatus|string|Status of Speed over Ground, if status is VALID, then sog contains the Speed |VALID,HIGH,NA|1, 2, 3, 18, 19|
|cog|deg|Course over Ground|0-359|1, 2, 3, 18, 19|
|utcTsSec|s|Seconds of UTC Time|0-59|1, 2, 3, 18, 19|
|utcTsStatus|string|Status of the utcTsSec Paramerter|NA, MANUAL, ESTIMATED, INOPERATIVE or INVALID|1, 2, 3, 18, 19|
|sog|kn|Speed over Ground|0-102.1|1, 2, 3, 9, 18, 19|
|sogStatus|string|Status of Speed over Ground, if status is VALID, then sog contains the Speed |VALID,HIGH,NA|1, 2, 3, 9, 18, 19|
|cog|deg|Course over Ground|0-359|1, 2, 3, 9, 18, 19|
|utcTsSec|s|Seconds of UTC Time|0-59|1, 2, 3, 9, 18, 19|
|utcTsStatus|string|Status of the utcTsSec Paramerter|NA, MANUAL, ESTIMATED, INOPERATIVE or INVALID|1, 2, 3, 9, 18, 19|
|vendorId|string|Vendor Name of the AIS equipment|-|24|
|mothershipMmsi|string|MMSI of Mothership|9 Digit Number|24|
|rot|deg/min|Rate of Turn|-126-126|1, 2, 3|
Expand All @@ -62,3 +62,9 @@
|dac|number|Designated area code|-|8|
|fid|number|Function identifier|-|8|
|data|string|Application specific data|-|8|
|altitude|m|Altitude of SAR aircraft|0-4094|9|
|altitudeStatus|string|Status of altitude|VALID, HIGH, NA|9|
|altitudeSensor|number|Altitude sensor type|0=GNSS, 1=barometric|9|
|dte|boolean|Data terminal ready|true,false|9|
|assignedMode|boolean|Assigned mode flag|true,false|9|
|raim|boolean|RAIM flag in use|true,false|9|
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