Active Maritime Navigation Warnings by NAVAREA (NGA)

nga/active-navigation-warnings

Lists the broadcast navigation warnings currently in force for one NAVAREA (4 for western HYDROLANT, 12 for HYDROPAC, A, C, P and others): year, number, subregion, issue date, issuing authority and the full free-text body, covering hazards, drilling unit positions, gunnery exercises and service outages. An area with no active warning returns an empty list. Some areas return a large list. National Geospatial-Intelligence Agency data, passed through unmodified and served by Eden Engine; not an official NGA product.

activeper callv1

Price

$0.0026 per call

You pay the price shown. If a call turns out to cost more than its quote, you pay the actual price, capped at twice the quote. No monthly minimum. Top-ups start at $5.

Data source

National Geospatial-Intelligence Agency

Source: National Geospatial-Intelligence Agency (NGA), Maritime Safety Information. A U.S. government work with no stated use restriction. No NGA or Department of Defense seal or endorsement is implied. Served by Eden Engine; not an official NGA product.

Use it

Five steps: search, inspect, learn, run, settle. No per-tool setup; your agent reaches this tool through the meta-tools it already has.

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agent

// 1. search: find the tool
omnial_search({ query: "what you need" })

// 2. inspect: price and input schema
omnial_inspect({ tool: "nga/active-navigation-warnings" })

// 3. learn: read the usage guide at runtime
omnial_learn({ tool: "nga/active-navigation-warnings" })

// 4. run: price the exact call first, then run it
omnial_execute({ tool: "nga/active-navigation-warnings", input: { /* see input_schema */ }, dry_run: true })
omnial_execute({ tool: "nga/active-navigation-warnings", input: { /* ... */ } })

// 5. settle: the call is charged when it finishes, nothing to do

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Pricing

Every charge this tool can incur.

Charge	Price
Per call	$0.0026

Updated: Oct 20, 2026

Input and output schemas

Input schema

input_schema.json

{
  "type": "object",
  "required": [
    "navArea"
  ],
  "properties": {
    "navArea": {
      "type": "string",
      "pattern": "^[0-9A-Za-z]{1,2}$",
      "description": "NAVAREA to list, as NGA labels it: a number such as 4 (HYDROLANT, western) or 12 (HYDROPAC), or a letter such as A, C or P. Busy areas such as A and P return more than 40 KB of text."
    }
  },
  "additionalProperties": false
}

Output schema

output_schema.json

{
  "type": "object",
  "required": [
    "results"
  ],
  "properties": {
    "results": {
      "type": "array",
      "items": {
        "type": "object",
        "required": [
          "msgYear",
          "msgNumber",
          "navArea",
          "text",
          "status"
        ],
        "properties": {
          "area": {
            "type": "string",
            "description": "Same as navArea."
          },
          "text": {
            "type": "string",
            "description": "Full warning text. Contains newlines; positions are written as DD-MM.mN/S DDD-MM.mE/W text."
          },
          "year": {
            "type": "integer",
            "description": "Same as msgYear."
          },
          "number": {
            "type": "integer",
            "description": "Same as msgNumber."
          },
          "status": {
            "type": "string",
            "description": "Warning status code as published (A for active)."
          },
          "msgYear": {
            "type": "integer",
            "description": "Year the warning was issued."
          },
          "navArea": {
            "type": "string",
            "description": "NAVAREA the warning belongs to."
          },
          "authority": {
            "type": "string",
            "description": "The originating authority and its reference."
          },
          "issueDate": {
            "type": "string",
            "description": "Issue date-time group as published, for example 101133Z MAY 2024."
          },
          "msgNumber": {
            "type": "integer",
            "description": "Warning number within the year and NAVAREA."
          },
          "subregion": {
            "type": "string",
            "description": "Subregion code, or GEN for a general warning."
          },
          "cancelDate": {
            "type": [
              "string",
              "null"
            ],
            "description": "Cancellation date-time group, null when not cancelled."
          },
          "cancelMsgYear": {
            "type": [
              "integer",
              "null"
            ]
          },
          "cancelNavArea": {
            "type": [
              "string",
              "null"
            ]
          },
          "cancelMsgNumber": {
            "type": [
              "integer",
              "null"
            ]
          }
        },
        "additionalProperties": true
      },
      "description": "Matching records; empty when nothing matches."
    }
  },
  "description": "The active warnings of the NAVAREA, newest first as NGA returns them.",
  "additionalProperties": true
}