Open Waters AIS

Coverage and sources

get_coverage

Read-onlyIdempotent

Where Open Waters AIS is hearing AIS right now: sources with their current delay, stations, freshness, and vessel counts. Pass a bounding box to learn which stations cover it and how many vessels are in it, or a station id for that station's numbers. Vessel counts cover the last 30 minutes; max_age widens them, to 7d for the last week or all for every vessel the network has heard. Call this before saying a region has no traffic.

Input Schema

TableJSON Schema

Name	Required	Description
`bbox`	No	report the stations covering this box and the vessels currently in it
`max_age`	No	count vessels heard within this long, network-wide and in bbox, instead of the last 30 minutes: a duration such as 6h, 24h, or 7d, or all for every vessel the network has heard
`station`	No	a station id from an earlier result, for that station's numbers

Output Schema

TableJSON Schema

Name	Required	Description	Default
`area`	No
`note`	No
`time`	Yes
`sources`	Yes
`station`	No
`summary`	Yes
`vessels`	Yes
`stations`	Yes
`events_per_second`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed3 schema fields changedOct 8, 2026

changedOutput schema / properties / area / properties / stations / items / properties / vessels / description

Previous value: -"distinct vessels heard in the last 30 minutes"New value: +"distinct vessels whose positions the station heard in the last 30 minutes, its own left out, up to about 7 minutes behind"

changedOutput schema / properties / sources / items / properties / vessels / description

Previous value: -"distinct vessels heard from this source in the last 30 minutes"New value: +"distinct vessels whose positions this source's stations heard in the last 30 minutes, up to about 7 minutes behind"

changedOutput schema / properties / station / properties / vessels / description

Previous value: -"distinct vessels heard in the last 30 minutes"New value: +"distinct vessels whose positions the station heard in the last 30 minutes, its own left out, up to about 7 minutes behind"

Changed8 schema fields changedSep 30, 2026

addedInput schema / properties / max_age

Added value: +{
+  "description": "count vessels heard within this long, network-wide and in bbox, instead of the last 30 minutes: a duration such as 6h, 24h, or 7d, or all for every vessel the network has heard",
+  "type": "string"
+}

changedOutput schema / properties / area / properties / vessels / description

Previous value: -"vessels with a position inside the box"New value: +"vessels whose last known position is inside the box, heard in the last 30 minutes or within max_age"

addedOutput schema / properties / vessels / properties / active

Added value: +{
+  "description": "vessels heard in the last 30 minutes",
+  "type": "integer"
+}

addedOutput schema / properties / vessels / properties / heard

Added value: +{
+  "description": "vessels heard within max_age; present when max_age is given",
+  "type": [
+    "null",
+    "integer"
+  ]
+}

addedOutput schema / properties / vessels / properties / new

Added value: +{
+  "description": "vessels first heard within max_age; present when max_age is a duration",
+  "type": [
+    "null",
+    "integer"
+  ]
+}

changedOutput schema / properties / vessels / properties / total / description

Previous value: -"vessels heard in the last 30 minutes"New value: +"every vessel the network has heard"

addedOutput schema / properties / vessels / properties / with_position / description
```
Added value: +"of the active vessels, those with a position"
```

changedOutput schema / properties / vessels / required

Previous value: -[
-  "total",
-  "with_position"
-]New value: +[
+  "total",
+  "active",
+  "with_position"
+]

Changed1 schema field changedSep 23, 2026

addedOutput schema / properties / sources / items / properties / delay

Added value: +{
+  "additionalProperties": false,
+  "description": "seconds from broadcast to arrival over the last position reports from this source",
+  "properties": {
+    "p50": {
+      "description": "median delay in seconds",
+      "type": "number"
+    },
+    "p99": {
+      "description": "99th percentile delay in seconds",
+      "type": "number"
+    }
+  },
+  "required": [
+    "p50",
+    "p99"
+  ],
+  "type": [
+    "null",
+    "object"
+  ]
+}

First observedSep 18, 2026

TDQS

Score is being calculated.

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