Military / Special Vessels
11,888 military / special vessels tracked worldwide
Military and special-purpose vessels (AIS type 33–35, 55–59) encompass a diverse range of government and specialized commercial ships. Military vessels include naval warships (frigates, destroyers, aircraft carriers, submarines), coast guard cutters, and patrol boats tasked with maritime security, territorial defense, and law enforcement. Special-purpose vessels include oceanographic and hydrographic research ships conducting seabed mapping and scientific surveys, cable-laying ships installing and repairing subsea telecommunications and power cables, trailing suction hopper dredgers maintaining navigable channel depths, diving support vessels equipped with saturation diving systems for deep-sea construction and inspection, icebreakers clearing shipping lanes in polar regions, and hospital ships providing medical facilities in humanitarian operations. Many military vessels transmit limited or encrypted AIS data, use military AIS (WAIS) on dedicated frequencies, or disable their transponders entirely during operations for security reasons—a practice known as “going dark” that distinguishes them from commercial vessels in tracking data.
Track military / special vessels worldwide
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Subtypes within the Military and Special-Purpose Category
This diverse category encompasses naval surface vessels — frigates, destroyers, corvettes, aircraft carriers, amphibious assault ships — as well as auxiliary and replenishment ships operated by national navies. Coast guard vessels include cutters, patrol boats, and offshore patrol vessels (OPVs) tasked with maritime law enforcement, search and rescue, fisheries protection, and counter-piracy. Special-purpose civilian and government vessels include oceanographic and hydrographic research ships, cable-laying ships, dredgers (trailing suction hopper, cutter suction, backhoe), diving support vessels, icebreakers, fire-fighting vessels, hospital ships, training ships, lighthouse tenders, and survey ships. The category also covers offshore support vessels (OSVs) including platform supply vessels (PSVs), construction support vessels, and well-stimulation ships in the oil and gas sector.
How Military and Special-Purpose Vessels Operate
Naval ships rotate through deployment cycles: forward deployment, return to homeport, maintenance, training, redeployment. Aircraft carriers operate at the centre of carrier strike groups, accompanied by escorts and supply ships. Coast guard vessels patrol national EEZs, intercept smuggling vessels, and conduct SAR. Research vessels follow scientific cruise plans set by funding institutions and agencies (NOAA, IFREMER, AWI, JAMSTEC). Cable-layers transit between cable-installation projects on multi-year schedules. Icebreakers maintain shipping channels through frozen waters in the Baltic, Russian Arctic, Great Lakes, and St. Lawrence Seaway in winter; some support polar research stations. Offshore support vessels operate on rotational charters from coastal supply hubs.
Tracking Military Vessels with AIS — and the Limits
Many naval vessels selectively transmit AIS or do not transmit during active operations — a legitimate practice to maintain operational security. Coast guard cutters generally transmit AIS during routine patrol and SAR. Research and survey ships almost always transmit. Auxiliary vessels (oilers, tenders, hospital ships) typically transmit. Geographic patterns of AIS visibility (e.g., consistent transmission during port visits and exercises with international partners, lower visibility during deployments) are themselves an analytic signal. For the public-facing maritime community, MarineRadar shows whatever AIS data is available — interpret absences with appropriate awareness of why a vessel may not be visible at a given moment.
Where Military and Special-Purpose Vessels Operate
Naval forces deploy worldwide based on national strategy — Mediterranean and Atlantic, Persian Gulf, Indian Ocean, Western Pacific, and the Arctic. Most navies operate primarily within home waters and adjacent EEZs. Coast guards patrol their respective EEZs. Major naval base concentrations include Norfolk and San Diego (USA), Yokosuka (Japan), Bahrain, Toulon (France), Portsmouth (UK), Severodvinsk (Russia), and Yulin (China). Polar icebreakers cluster around the Arctic Ocean, Antarctic gateways (Hobart, Punta Arenas, Cape Town), and the Baltic. Cable ships home-port at Calais, Lisbon, Yokohama, and Auckland. Offshore support vessels concentrate at every offshore oil and gas hub.
Regulations Specific to Military and Special-Purpose Vessels
Naval vessels are exempt from many civilian regulations — SOLAS Article 1 explicitly excludes warships and military auxiliaries, leaving safety to flag-state military regulations. They generally must still observe the COLREGS (collision regulations) for safety at sea. Coast guards typically follow flag-state military rules but operate transparently on AIS for visibility. Special-purpose civilian vessels (research, cable-laying, dredging, icebreaking) are subject to standard SOLAS, MARPOL, and STCW unless specifically exempted. The IMO Polar Code applies to all ships in polar waters including research and naval vessels. Diving support vessels follow IMO MSC.235(82) for dynamically positioned diving operations. Offshore support vessels follow MARPOL Annex IV/V on offshore waste handling and the IMO MODU Code where relevant.