Live overview

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Selected ships

15

The line shows where a ship would be after this many minutes if its course and speed stay the same.

Map guide & units

Ship fill colour shows length. Select a ship to read its reported length; an outline without a fill means length is unavailable.

  • Green · under 50 m
  • Yellow · 50 to under 150 m
  • Orange · 150 to under 250 m
  • Red · 250 to under 350 m
  • Black · 350 m or more

The red and blue outlines identify selected ships A and B. Warning symbols mark projected close approaches; they do not confirm a collision.

SOG (Speed over Ground) is speed over the Earth's surface. COG (Course over Ground) is the direction of travel. MMSI identifies a ship's AIS radio.

nm = nautical miles (1 nm = 1,852 m). kn = knots (1 nautical mile per hour). min = minutes.

The green boundary marks the data subscription area. Red areas show traffic but are excluded from encounter calculations.

Experimental viewer for learning and exploration. Do not use it for navigation or safety decisions. Read the limitations.

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Projected close approaches

Soonest CPA first

Pairs expected to pass within 0.5 nm in the next 10 minutes, based on reported movement. Select a pair to inspect it.

0

Show encounters at or above this score. CRI runs from 0–99.

CRI (Collision Risk Index) is an experimental score from 0–99, based on vessel size, speed and course difference. A higher score gives an encounter greater weight in this model. It is not a probability of collision or a measure of impact force.

CRI 0
Incomplete AIS data
Select a ship on the map to see its details. Select a second ship to compare CPA and TCPA. Select a ship again to remove it from the pair.
TCPA (Time to CPA) estimates the minutes until the ships are closest together, assuming both keep their reported course and speed.
CPA (Closest Point of Approach) estimates how close two ships will pass if both keep their reported course and speed. Distances are shown in nm (nautical miles).
These encounters receive a score of 0 under the current model. A score of 0 does not confirm that an encounter is safe.
These encounters have a missing ship name or missing dimensions in the available AIS reports. They are shown separately because the information may not support a meaningful comparison.