The 2011 Annual Marine Institute oceanographic survey in the North Atlantic Ocean took place in January 2011 on board the Marine Institute's R.V. Celtic Explorer in the North East Atlantic Ocean. The aim of the cruise was to collect CTD profile data along the standard offshore stations. The samples were used for o Nutrient sampling o Phytoplankton and chlorophyll samples o Salinity samples o Water Chemistry: DIC, TA, DOC, TOC ,DO samples Grab samples at key locations on the Irish shelf were also collected. An ADCP (acoustic Doppler current profiler) was also deployed off Belmullet, Co. Mayo on the West Coast of Ireland. The M6 weather buoy was not serviced as planned during this cruise due to weather constraints. Three moorings were deployed for the Irish Whale and Dolphin Group (IWDG). The main purpose of this annual cruise is to collect oceanographic data (such as CTD and nutrient sampling) which will contribute to establishing baseline oceanic weather and oceanic conditions from which future changes can be assessed.