ais-json-english

A npm package about AIS (Automatic Identification System) text decoding.

Originally forked from https://www.npmjs.com/package/ais-json

Decode AIS text, then return JSON object.

npm address: https://www.npmjs.com/package/ais-json-english

Structure

| Name | Description | | -------------- | ------------------------------------------------------------------------------ | | index.js | main function (call decode.js and include verify ais text) | | encode.js | generate ascii6bit.json and num2char.json | | decode.js | decode ais text and return json (base on ascii6bit.json and num2char.json) | | ascii6bit.json | connect ascii to 6 bit code | | num2char.json | connect number to char |

Install

npm install ais-json-english

Usage

In Terminal

npx ais '!AIVDM,1,1,,A,15Cgah00008LOnt>1Cf`s6NT00SU,0*3D'

Then, you will get:

{
  "MessageID": {
    "name": "MessageID",
    "data": 1,
    "info": "Ship Position Report"
  },
  "DataIndicator": {
    "name": "Forward Indicator",
    "data": 0,
    "info": "Default"
  },
  "UserID": {
    "name": "UserID(MMSI)",
    "data": 356248000,
    "info": 356248000
  },
  "NaviStatus": {
    "name": "NavStatus",
    "data": 0,
    "info": "Under way using Engine"
  },
  "ROT": {
    "name": "ROT",
    "data": "0°/min",
    "info": "0°/min"
  },
  "SOG": {
    "name": "SOG",
    "data": "0 section",
    "info": "0 section"
  },
  "Accuracy": {
    "name": "Accuracy",
    "data": 0,
    "info": "High(<10m)"
  },
  "Location": {
    "name": "Coordinate",
    "data": [118.07354333333333, 24.502496666666666],
    "info": "E 118°4.4126′ , N 24°30.1498′"
  },
  "COG": {
    "name": "COG",
    "data": "228.4°",
    "info": "228.4°"
  },
  "Heading": {
    "name": "HDT",
    "data": "207°",
    "info": "207°"
  },
  "Second": {
    "name": "timestamp",
    "data": 18,
    "info": "18 seconds past the minute"
  },
  "RegionalApplication": {
    "name": "specific indicator",
    "data": 0,
    "info": "Unavailable"
  },
  "Spare": {
    "name": "spare",
    "data": 0,
    "info": "Unused"
  },
  "RAIM": {
    "name": "RAIM",
    "data": 0,
    "info": "RAIM not used"
  },
  "CommunicationState": {
    "name": "CommStatus",
    "data": "0000000100011100101",
    "info": "SOTDMA 4:57 UTC"
  },
  "text": "!AIVDM,1,1,,A,15Cgah00008LOnt>1Cf`s6NT00SU,0*3D"
}

In Project

Decode AIS Text

# const ais = require('ais-json-english')
import ais from 'ais-json-english'
let aisinfo = ais('!AIVDM,1,1,,A,15Cgah00008LOnt>1Cf`s6NT00SU,0*3D')

Open SerialPort

If you need it.

node-serialport

cd ais-json-english
node serialport

Default

Port: COM3
BaudRate: 38400

Encode Table

cd ais-json-english
node encode

Generate ascii6bit.json and num2char.json.

Intend

• [ ] CLI