Open Waters AIS

Vessels near a point or vessel

find_vessels_near

Read-onlyIdempotent

Vessels within a radius (default 10 NM, maximum 50) of a point or of another vessel's last known position, nearest first, each with distance and bearing from the centre. Use for what is near this position or what is around vessel X.

Input Schema

TableJSON Schema

Name	Required	Description
`lat`	No	centre latitude, degrees; give lat and lon, or mmsi
`lon`	No	centre longitude, degrees
`flag`	No	only vessels flying this flag: ISO 3166-1 alpha-2, e.g. NO, FI, MH
`kind`	No	only this kind: vessel, aton, base, or sar
`mmsi`	No	centre on this vessel's last position instead of lat and lon; the vessel itself is left out of the results
`limit`	No	rows to return: default 50, maximum 200
`types`	No	only these ITU ship type codes; a code ending in 0 matches its decade
`radius_nm`	No	search radius in nautical miles: default 10, maximum 50

Output Schema

TableJSON Schema

Name	Required	Description
`total`	Yes	vessels matched before the limit was applied
`vessels`	Yes
`truncated`	Yes	true when rows were left out: total exceeds the rows returned, so narrow the query or raise limit, or an IMO number is reported by more than the 10 vessels returned for it
`attribution`	Yes	credit line per source kind in the rows, to show with the data
`unknown_imo`	No	requested IMO numbers matching no vessel the network has heard
`unknown_mmsi`	No	requested MMSIs matching no vessel the network has heard

Schema Changelog

Changes observed during successful MCP inspections.

Changed1 schema field changedOct 8, 2026

changedOutput schema / properties / truncated / description

Previous value: -"true when total exceeds the rows returned; narrow the query or raise limit"New value: +"true when rows were left out: total exceeds the rows returned, so narrow the query or raise limit, or an IMO number is reported by more than the 10 vessels returned for it"

Changed1 schema field changedOct 3, 2026

changed

Output schema / properties / vessels / items / properties / sources / additionalProperties / properties / url / description

Previous value: -"the source's own page for this vessel"New value: +"the source's page for this vessel, or its public search when the source keeps no per-vessel pages"

Changed1 schema field changedOct 3, 2026

addedOutput schema / properties / vessels / items / properties / particulars / properties / callsign

Added value: +{
+  "description": "call sign as registered; the callsign in the vessel's own properties is the one AIS reports",
+  "type": "string"
+}

Changed5 schema fields changedOct 2, 2026

addedOutput schema / properties / vessels / items / properties / particulars

Added value: +{
+  "additionalProperties": false,
+  "description": "particulars as registered, merged from the enrichment sources into one vocabulary (get_vessels)",
+  "properties": {
+    "beam": {
+      "description": "beam as registered, metres",
+      "type": "number"
+    },
+    "builder": {
+      "description": "shipyard or builder",
+      "type": "string"
+    },
+    "commons_category": {
+      "description": "the category of the ship's photos on Wikimedia Commons",
+      "type": "string"
+    },
+    "deadweight": {
+      "description": "deadweight, tonnes",
+      "type": "integer"
+    },
+    "depth": {
+      "description": "registered depth, metres",
+      "type": "number"
+    },
+    "draught": {
+      "description": "design draught, metres; AIS reports the draught on the current voyage",
+      "type": "number"
+    },
+    "former_names": {
+      "description": "names the vessel has carried before, oldest first",
+      "items": {
+        "type": "string"
+      },
+      "type": [
+        "null",
+        "array"
+      ]
+    },
+    "gross_tonnage": {
+      "type": "integer"
+    },
+    "home_port": {
+      "description": "port of registry",
+      "type": "string"
+    },
+    "identification": {
+      "description": "the flag state's number for the vessel: a documented vessel's official number, else its state registration",
+      "type": "string"
+    },
+    "image": {
+      "description": "the Commons page of a photo of the ship, which shows its license and credit",
+      "type": "string"
+    },
+    "length": {
+      "description": "length as registered, metres; may differ from the AIS length",
+      "type": "number"
+    },
+    "net_tonnage": {
+      "type": "integer"
+    },
+    "operator": {
+      "type": "string"
+    },
+    "owner": {
+      "type": "string"
+    },
+    "registered_name": {
+      "description": "name as documented with the flag state, when it differs from what AIS reports",
+      "type": "string"
+    },
+    "registry": {
+      "description": "country of registry, in English",
+      "type": "string"
+    },
+    "service": {
+      "description": "flag-state service type, e.g. Towing Vessel, Passenger (Inspected), Recreational",
+      "type": "string"
+    },
+    "ship_type": {
+      "description": "kind of ship, e.g. bulk carrier, container ship, ferry",
+      "type": "string"
+    },
+    "status": {
+      "description": "flag-state status, e.g. Active, Laid Up",
+      "type": "string"
+    },
+    "tonnage_measure": {
+      "description": "how a tonnage from the flag state was measured: Convention (the international system), Regulatory (the older US system, in register tons), or Simplified (small vessels)",
+      "type": "string"
+    },
+    "wikipedia": {
+      "description": "the ship's English Wikipedia article",
+      "type": "string"
+    },
+    "yard_number": {
+      "description": "the builder's hull number",
+      "type": "string"
+    },
+    "year_built": {
+      "type": "integer"
+    }
+  },
+  "type": [
+    "null",
+    "object"
+  ]
+}

addedOutput schema / properties / vessels / items / properties / provenance

Added value: +{
+  "additionalProperties": {
+    "type": "string"
+  },
+  "description": "the source of each particulars field, by the field's name; values are keys of sources (get_vessels)",
+  "type": "object"
+}

addedOutput schema / properties / vessels / items / properties / sources

Added value: +{
+  "additionalProperties": {
+    "additionalProperties": false,
+    "properties": {
+      "credit": {
+        "description": "display credit for the source",
+        "type": "string"
+      },
+      "license": {
+        "type": "string"
+      },
+      "url": {
+        "description": "the source's own page for this vessel",
+        "type": "string"
+      }
+    },
+    "required": [
+      "credit",
+      "license"
+    ],
+    "type": "object"
+  },
+  "description": "each contributing source's credit, license, and its own page for this vessel (get_vessels)",
+  "type": "object"
+}

removedOutput schema / properties / vessels / items / properties / uscg

Removed value: -{
-  "additionalProperties": false,
-  "description": "particulars as documented with the US Coast Guard, for a US-flag vessel whose call sign and name match a vessel in its PSIX database (get_vessels)",
-  "properties": {
-    "beam": {
-      "description": "registered breadth, metres",
-      "type": "number"
-    },
-    "depth": {
-      "description": "registered depth, metres",
-      "type": "number"
-    },
-    "gross_tonnage": {
-      "type": "integer"
-    },
-    "id": {
-      "description": "the vessel's ID in PSIX",
-      "type": "integer"
-    },
-    "identification": {
-      "description": "the official number of a documented vessel, else its state registration",
-      "type": "string"
-    },
-    "length": {
-      "description": "registered length, metres",
-      "type": "number"
-    },
-    "license": {
-      "description": "public domain (U.S. government work), no credit required",
-      "type": "string"
-    },
-    "name": {
-      "description": "name as documented with the Coast Guard",
-      "type": "string"
-    },
-    "net_tonnage": {
-      "type": "integer"
-    },
-    "service": {
-      "description": "service type, e.g. Towing Vessel, Passenger (Inspected), Commercial Fishing Vessel, Recreational",
-      "type": "string"
-    },
-    "status": {
-      "description": "Coast Guard status, e.g. Active, Laid Up",
-      "type": "string"
-    },
-    "tonnage_measure": {
-      "description": "how the tonnage was measured: Convention (the international system), Regulatory (the older US system, in register tons), or Simplified (small vessels)",
-      "type": "string"
-    },
-    "year_built": {
-      "type": "integer"
-    }
-  },
-  "required": [
-    "id",
-    "license",
-    "name"
-  ],
-  "type": [
-    "null",
-    "object"
-  ]
-}

removedOutput schema / properties / vessels / items / properties / wikidata

Removed value: -{
-  "additionalProperties": false,
-  "description": "particulars as registered, from the vessel's Wikidata item found by its IMO number (get_vessels)",
-  "properties": {
-    "beam": {
-      "description": "beam as registered, metres",
-      "type": "number"
-    },
-    "builder": {
-      "description": "shipyard or builder",
-      "type": "string"
-    },
-    "commons_category": {
-      "description": "the category of the ship's photos on Wikimedia Commons",
-      "type": "string"
-    },
-    "deadweight": {
-      "description": "deadweight, tonnes",
-      "type": "integer"
-    },
-    "draught": {
-      "description": "design draught, metres; AIS reports the draught on the current voyage",
-      "type": "number"
-    },
-    "former_names": {
-      "description": "names the vessel has carried before, oldest first",
-      "items": {
-        "type": "string"
-      },
-      "type": [
-        "null",
-        "array"
-      ]
-    },
-    "gross_tonnage": {
-      "type": "integer"
-    },
-    "home_port": {
-      "description": "port of registry",
-      "type": "string"
-    },
-    "id": {
-      "description": "Wikidata item ID",
-      "type": "string"
-    },
-    "image": {
-      "description": "the Commons page of a photo of the ship, which shows its license and credit",
-      "type": "string"
-    },
-    "length": {
-      "description": "length as registered, metres; may differ from the AIS length",
-      "type": "number"
-    },
-    "license": {
-      "description": "CC0-1.0: public domain, no credit required; the photos image and commons_category lead to carry their own licenses",
-      "type": "string"
-    },
-    "operator": {
-      "type": "string"
-    },
-    "owner": {
-      "type": "string"
-    },
-    "registry": {
-      "description": "country of registry, in English",
-      "type": "string"
-    },
-    "ship_type": {
-      "description": "kind of ship, e.g. bulk carrier, container ship, oil tanker, ferry",
-      "type": "string"
-    },
-    "url": {
-      "description": "the item's page on Wikidata",
-      "type": "string"
-    },
-    "wikipedia": {
-      "description": "the ship's English Wikipedia article",
-      "type": "string"
-    },
-    "yard_number": {
-      "description": "the builder's hull number",
-      "type": "string"
-    },
-    "year_built": {
-      "description": "year the vessel entered service",
-      "type": "integer"
-    }
-  },
-  "required": [
-    "id",
-    "url",
-    "license"
-  ],
-  "type": [
-    "null",
-    "object"
-  ]
-}

Changed2 schema fields changedOct 1, 2026

addedOutput schema / properties / vessels / items / properties / uscg

Added value: +{
+  "additionalProperties": false,
+  "description": "particulars as documented with the US Coast Guard, for a US-flag vessel whose call sign and name match a vessel in its PSIX database (get_vessels)",
+  "properties": {
+    "beam": {
+      "description": "registered breadth, metres",
+      "type": "number"
+    },
+    "depth": {
+      "description": "registered depth, metres",
+      "type": "number"
+    },
+    "gross_tonnage": {
+      "type": "integer"
+    },
+    "id": {
+      "description": "the vessel's ID in PSIX",
+      "type": "integer"
+    },
+    "identification": {
+      "description": "the official number of a documented vessel, else its state registration",
+      "type": "string"
+    },
+    "length": {
+      "description": "registered length, metres",
+      "type": "number"
+    },
+    "license": {
+      "description": "public domain (U.S. government work), no credit required",
+      "type": "string"
+    },
+    "name": {
+      "description": "name as documented with the Coast Guard",
+      "type": "string"
+    },
+    "net_tonnage": {
+      "type": "integer"
+    },
+    "service": {
+      "description": "service type, e.g. Towing Vessel, Passenger (Inspected), Commercial Fishing Vessel, Recreational",
+      "type": "string"
+    },
+    "status": {
+      "description": "Coast Guard status, e.g. Active, Laid Up",
+      "type": "string"
+    },
+    "tonnage_measure": {
+      "description": "how the tonnage was measured: Convention (the international system), Regulatory (the older US system, in register tons), or Simplified (small vessels)",
+      "type": "string"
+    },
+    "year_built": {
+      "type": "integer"
+    }
+  },
+  "required": [
+    "id",
+    "license",
+    "name"
+  ],
+  "type": [
+    "null",
+    "object"
+  ]
+}

addedOutput schema / properties / vessels / items / properties / wikidata

Added value: +{
+  "additionalProperties": false,
+  "description": "particulars as registered, from the vessel's Wikidata item found by its IMO number (get_vessels)",
+  "properties": {
+    "beam": {
+      "description": "beam as registered, metres",
+      "type": "number"
+    },
+    "builder": {
+      "description": "shipyard or builder",
+      "type": "string"
+    },
+    "commons_category": {
+      "description": "the category of the ship's photos on Wikimedia Commons",
+      "type": "string"
+    },
+    "deadweight": {
+      "description": "deadweight, tonnes",
+      "type": "integer"
+    },
+    "draught": {
+      "description": "design draught, metres; AIS reports the draught on the current voyage",
+      "type": "number"
+    },
+    "former_names": {
+      "description": "names the vessel has carried before, oldest first",
+      "items": {
+        "type": "string"
+      },
+      "type": [
+        "null",
+        "array"
+      ]
+    },
+    "gross_tonnage": {
+      "type": "integer"
+    },
+    "home_port": {
+      "description": "port of registry",
+      "type": "string"
+    },
+    "id": {
+      "description": "Wikidata item ID",
+      "type": "string"
+    },
+    "image": {
+      "description": "the Commons page of a photo of the ship, which shows its license and credit",
+      "type": "string"
+    },
+    "length": {
+      "description": "length as registered, metres; may differ from the AIS length",
+      "type": "number"
+    },
+    "license": {
+      "description": "CC0-1.0: public domain, no credit required; the photos image and commons_category lead to carry their own licenses",
+      "type": "string"
+    },
+    "operator": {
+      "type": "string"
+    },
+    "owner": {
+      "type": "string"
+    },
+    "registry": {
+      "description": "country of registry, in English",
+      "type": "string"
+    },
+    "ship_type": {
+      "description": "kind of ship, e.g. bulk carrier, container ship, oil tanker, ferry",
+      "type": "string"
+    },
+    "url": {
+      "description": "the item's page on Wikidata",
+      "type": "string"
+    },
+    "wikipedia": {
+      "description": "the ship's English Wikipedia article",
+      "type": "string"
+    },
+    "yard_number": {
+      "description": "the builder's hull number",
+      "type": "string"
+    },
+    "year_built": {
+      "description": "year the vessel entered service",
+      "type": "integer"
+    }
+  },
+  "required": [
+    "id",
+    "url",
+    "license"
+  ],
+  "type": [
+    "null",
+    "object"
+  ]
+}

Changed2 schema fields changedSep 28, 2026

changedOutput schema / properties / unknown_imo / description

Previous value: -"requested IMO numbers matching no vessel heard in the last 30 minutes"New value: +"requested IMO numbers matching no vessel the network has heard"

changedOutput schema / properties / unknown_mmsi / description

Previous value: -"requested MMSIs not heard in the last 30 minutes"New value: +"requested MMSIs matching no vessel the network has heard"

Changed10 schema fields changedSep 21, 2026

addedInput schema / properties / flag

Added value: +{
+  "description": "only vessels flying this flag: ISO 3166-1 alpha-2, e.g. NO, FI, MH",
+  "type": "string"
+}

addedOutput schema / properties / unknown_imo

Added value: +{
+  "description": "requested IMO numbers matching no vessel heard in the last 30 minutes",
+  "items": {
+    "maximum": 4294967295,
+    "minimum": 0,
+    "type": "integer"
+  },
+  "type": [
+    "null",
+    "array"
+  ]
+}

addedOutput schema / properties / vessels / items / properties / beam

Added value: +{
+  "description": "beam, metres",
+  "maximum": 65535,
+  "minimum": 0,
+  "type": [
+    "null",
+    "integer"
+  ]
+}

addedOutput schema / properties / vessels / items / properties / callsign
```
Added value: +{
+  "type": "string"
+}
```

addedOutput schema / properties / vessels / items / properties / destination

Added value: +{
+  "description": "destination as typed by the crew: a port name, a UN/LOCODE, or nothing useful",
+  "type": "string"
+}

addedOutput schema / properties / vessels / items / properties / draught

Added value: +{
+  "description": "maximum static draught, metres",
+  "type": [
+    "null",
+    "number"
+  ]
+}

addedOutput schema / properties / vessels / items / properties / eta

Added value: +{
+  "description": "estimated arrival as sent, MM-DD HH:MM UTC or MM-DD; AIS carries no year, so read it as the next occurrence",
+  "type": "string"
+}

addedOutput schema / properties / vessels / items / properties / flag

Added value: +{
+  "description": "ISO 3166-1 alpha-2 code of the flag state, from the MMSI's maritime identification digits",
+  "type": "string"
+}

addedOutput schema / properties / vessels / items / properties / imo

Added value: +{
+  "description": "IMO number, once the vessel's static data has been heard",
+  "maximum": 4294967295,
+  "minimum": 0,
+  "type": "integer"
+}

addedOutput schema / properties / vessels / items / properties / length

Added value: +{
+  "description": "overall length, metres",
+  "maximum": 65535,
+  "minimum": 0,
+  "type": [
+    "null",
+    "integer"
+  ]
+}

First observedSep 18, 2026

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