Updated 14 November 2026
Gangway AIS keeps its own record of what vessels broadcast and what they did. Our own record runs worldwide from 7 October 2026 and grows every minute. Before that we hold a year of Danish waters from 28 October 2025 with US coastal waters for November 2025 to June 2026, from the official open archives of the Danish Emergency Management Agency and of NOAA and BOEM (Marine Cadastre). Here is what you can ask of it and how far back each plan reaches.
Every AIS report our sources hear is kept with its time and source, as is every position of the Danish and US archives, marked with the archive it came from. From those reports we work out port calls with arrival and departure times, time at anchor and alongside, waiting times before berthing, transits and port events such as pilot, tug, bunkering and anchoring.
Port calls, arrivals and departures, waiting times at anchor and port events are worked out by us wherever we hear vessels. Port answers name the terminal or anchorage instead of giving coordinates.
Tracks, port calls and activity reach back 7 days on the free API allowance, 90 days on Plus and up to 12 months on Pro and Scale.
Within that reach a window before 7 October 2026 is answered from the Danish and US archives where the vessel was in those waters; elsewhere it begins where our record begins. Port calls, port reports and monthly waiting reports at Danish and US ports are worked out from the archives as from our own record. The record grows each day, so the longest windows get longer as time passes.
Vessel positions, tracks and the live stream through the API come only from sources whose licence lets us pass them on. Today that means Norway, parts of the Baltic and the areas of our own and volunteer stations; for the past also Danish and US coastal waters from their archives. A free account shows which.
Elsewhere a vessel is answered with her position withheld, while her port calls and waiting times are still given.
Vessel history, port call summaries, port waiting reports by month and AIS call timelines come as JSON or as a printable page with a verification code. Anyone can check a code at gangwayais.com/verify. A report is a record of AIS reports, not a finding. Notice of readiness, laytime and demurrage are for the parties to count.
A period not heard is a time our sources did not receive the vessel. It does not by itself show that her AIS was switched off. Every report says how well its period was heard. Tracks are not interpolated.
A free API key gives 1,000 credits a month with data 24 hours behind and 7 days of history. Then read the vessel port calls, vessel track and vessel history pages, or ask in plain words through the MCP connector: a free key answers nine of its tools, a paid plan all of them. The sources and their licences are on Data sources.
AIS data can be late, missing or wrong. Not for navigation.
More guides: Vessel tracking API · Port waiting times · AIS data in Europe · All reports · All ports · Tankers · Container vessels · Bulk carriers · Ferries
Gangway AIS is built and run by Motto Marine International. Write to desk@gangwayais.com