> ## Documentation Index > Fetch the complete documentation index at: https://www.worldmonitor.app/docs/llms.txt > Use this file to discover all available pages before exploring further. # ListNavigationalWarnings > ListNavigationalWarnings retrieves active maritime safety warnings from NGA. ## OpenAPI ````yaml /api/MaritimeService.openapi.yaml get /api/maritime/v1/list-navigational-warnings openapi: 3.1.0 info: title: MaritimeService API version: 1.0.0 servers: - url: https://api.worldmonitor.app security: - WorldMonitorKey: [] - ApiKeyHeader: [] paths: /api/maritime/v1/list-navigational-warnings: get: tags: - MaritimeService summary: ListNavigationalWarnings description: >- ListNavigationalWarnings retrieves active maritime safety warnings from NGA. operationId: ListNavigationalWarnings parameters: - name: page_size in: query description: |- Maximum items per page (1-100). Accepted but currently ignored; no-op until this handler supports the parameter. required: false example: 25 schema: type: integer format: int32 - name: cursor in: query description: |- Cursor for next page. Accepted but currently ignored; no-op until this handler supports the parameter. required: false example: next-page-token schema: type: string - name: area in: query description: Optional area filter (e.g., "NAVAREA IV", "Persian Gulf"). required: false example: example schema: type: string - name: jmespath in: query description: >- Optional JMESPath expression applied server-side to project or reduce the JSON response before it is returned (mirrors the MCP jmespath argument). Invalid expressions, expressions larger than 1024 UTF-8 bytes, or projections that exceed the 256 KB output cap return HTTP 400 with a {_jmespath_error, original_keys} envelope. Grammar and worked examples: https://www.worldmonitor.app/docs/mcp-jmespath. required: false example: keys(@) schema: type: string responses: '200': description: Successful response content: application/json: example: pagination: nextCursor: next-page-token totalCount: 1 warnings: - area: example authority: example expiresAt: 1717200000000 id: example-id issuedAt: 1717200000000 schema: $ref: '#/components/schemas/ListNavigationalWarningsResponse' '400': description: Validation error content: application/json: schema: oneOf: - $ref: '#/components/schemas/ValidationError' - $ref: '#/components/schemas/JmespathProjectionError' '401': description: Missing or invalid API key. content: application/json: schema: $ref: '#/components/schemas/UnauthorizedError' '403': description: >- API access requires an active subscription (the API key's subscription is inactive or expired). content: application/json: schema: $ref: '#/components/schemas/ForbiddenError' '429': description: Rate limit exceeded. headers: X-RateLimit-Limit: description: Maximum requests allowed in the active rate-limit window. schema: type: string X-RateLimit-Remaining: description: Requests remaining in the active rate-limit window. schema: type: string X-RateLimit-Reset: description: >- Unix epoch milliseconds when the active rate-limit window resets. schema: type: string Retry-After: description: Seconds to wait before retrying the request. schema: type: string content: application/json: schema: oneOf: - $ref: '#/components/schemas/Error' - $ref: '#/components/schemas/RateLimitError' default: description: Gateway or handler error response. content: application/json: schema: oneOf: - $ref: '#/components/schemas/Error' - $ref: '#/components/schemas/GatewayError' components: schemas: ListNavigationalWarningsResponse: type: object properties: warnings: type: array items: $ref: '#/components/schemas/NavigationalWarning' pagination: $ref: '#/components/schemas/PaginationResponse' description: >- ListNavigationalWarningsResponse contains navigational warnings matching the request. ValidationError: type: object properties: violations: type: array items: $ref: '#/components/schemas/FieldViolation' description: List of validation violations required: - violations description: >- ValidationError is returned when request validation fails. It contains a list of field violations describing what went wrong. JmespathProjectionError: description: >- Returned when a REST jmespath projection is invalid or exceeds the expression/output byte limits. properties: _jmespath_error: description: Projection error discriminator and details. type: string original_keys: description: Top-level keys or shape of the unprojected response. items: type: string type: array required: - _jmespath_error - original_keys type: object UnauthorizedError: type: object properties: error: type: string description: Human-readable error message. required: - error description: >- Returned when the API key is missing, malformed, or lacks current API access. ForbiddenError: type: object properties: error: type: string description: Human-readable entitlement failure reason. requiredTier: type: integer format: int32 description: Minimum entitlement tier required for this endpoint. currentTier: type: integer format: int32 description: Caller entitlement tier when known. planKey: type: string description: Caller plan key when known. required: - error description: >- Returned when a PRO-gated endpoint denies access because the caller has no resolved authenticated user, entitlements cannot be verified, or the caller lacks the required entitlement tier. Error: type: object properties: message: type: string description: Error message (e.g., 'user not found', 'database connection failed') description: >- Error is returned when a handler encounters an error. It contains a simple error message that the developer can customize. RateLimitError: type: object description: Returned when a gateway or handler rate limit rejects the request. properties: error: type: string description: Human-readable rate-limit failure reason. required: - error GatewayError: type: object description: >- Returned by gateway infrastructure errors before an RPC handler runs, such as origin, routing, method, authentication, or quota checks. properties: error: oneOf: - type: string - type: object additionalProperties: true description: Gateway error reason or structured gateway failure details. required: - error NavigationalWarning: type: object properties: id: type: string description: Warning identifier. title: type: string description: Warning title. text: type: string description: Full warning text. area: type: string description: Geographic area affected. location: $ref: '#/components/schemas/GeoCoordinates' issuedAt: type: integer format: int64 description: >- Warning issue date, as Unix epoch milliseconds.. Warning: Values > 2^53 may lose precision in JavaScript expiresAt: type: integer format: int64 description: >- Warning expiry date, as Unix epoch milliseconds.. Warning: Values > 2^53 may lose precision in JavaScript authority: type: string description: Warning source authority. description: NavigationalWarning represents a maritime safety warning from NGA. PaginationResponse: type: object properties: nextCursor: type: string description: >- Cursor for fetching the next page. Empty string indicates no more pages. totalCount: type: integer format: int32 description: >- Total count of items matching the query, if known. Zero if the total is unknown. description: >- PaginationResponse contains pagination metadata returned alongside list results. FieldViolation: type: object properties: field: type: string description: >- The field path that failed validation (e.g., 'user.email' for nested fields). For header validation, this will be the header name (e.g., 'X-API-Key') description: type: string description: >- Human-readable description of the validation violation (e.g., 'must be a valid email address', 'required field missing') required: - field - description description: FieldViolation describes a single validation error for a specific field. GeoCoordinates: type: object properties: latitude: type: number maximum: 90 minimum: -90 format: double description: Latitude in decimal degrees (-90 to 90). longitude: type: number maximum: 180 minimum: -180 format: double description: Longitude in decimal degrees (-180 to 180). description: GeoCoordinates represents a geographic location using WGS84 coordinates. securitySchemes: WorldMonitorKey: type: apiKey in: header name: X-WorldMonitor-Key description: User-issued WorldMonitor API key. ApiKeyHeader: type: apiKey in: header name: X-Api-Key description: Alias header for the WorldMonitor API key (X-WorldMonitor-Key). ````