any vessel partaking in unregulated fishing and thus bar them from receiving services from any member of the North East Atlantic Fisheries Commission in order to make unregulated fishing unprofitable. The Icelandic Coast Guard also occasionally operates within Greenlandic and Faeroese waters, following a bilateral agreement with Denmark regarding mutual aid in security, rescue and defence matters. The Coast Guard accomplishes these tasks with the use of offshore patrol vessels (OPV), helicopters, surveillance aircraft, satellites and a network of land based surface scanning radar. The Icelandic Coast Guard is also in charge of the Iceland Air Defence System, which operates four ground-based AN-FPS(V)5 air surveillance radars and a control and command centre. In the 1990s the Coast Guard started hosting exercises such as "Northern Challenge" which had military units from Norway, Denmark, Sweden and the United Kingdom, among others, participating along with the Icelandic Coast Guard. The Coast Guard has also taken part in peacekeeping operations on behalf of the Icelandic Crisis Response Unit, although while usually using their own rank insignia, uniforms and weapons. The fleet also takes part in Frontex operations, and in that role played a major part in the rescue of over 300 Syrian refugees in the eastern Mediterranean Sea in January 2015. Fleet , the Icelandic Coast Guard fleet consists of two OPVs, one coastal hydrographic and patrol vessel and an independent fast rigid-hulled inflatable boat (RHIB), as well as numerous smaller boats assigned to the larger units. In 2011 the Coast Guard received ICGV Þór , built by the Asmar shipyard in Talcahuano, Chile. ICGV Týr, an , the second youngest, built by Århus Flydedok a/s and launched in 1975. , lead ship of the Ægir class, is ICGV Týrs sister ship, built by Ålborg Værft a/s and launched in 1968. Each ship is equipped with two or more RHIBs of various sizes and armed with a 40 mm Bofors cannon. Various kinds of small arms as well as other man-portable weapons are also carried on board each of the ships. Týr and Þór are also equipped with sonar systems and the Ægir-class vessels have flight decks and a hangar for a small helicopter. While the Coast Guard doesn't operate small enough helicopters to use the hangars, the flight decks are often used by the helicopters of the Aeronautical Division on various missions. The coastguard has as well a 73-ton patrol and hydrographic survey