| Code | Data type |
| B01 | Primary productivity |
| B02 | Phytoplankton pigments (eg chlorophyll, fluorescence) |
| B03 | Seston |
| B06 | Dissolved organic matter (inc DOC) |
| B07 | Pelagic bacteria/micro-organisms |
| B08 | Phytoplankton |
| B09 | Zooplankton |
| B10 | Neuston |
| B11 | Nekton |
| B13 | Eggs & larvae |
| B14 | Pelagic fish |
| B16 | Benthic bacteria/micro-organisms |
| B17 | Phytobenthos |
| B18 | Zoobenthos |
| B19 | Demersal fish |
| B20 | Molluscs |
| B21 | Crustaceans |
| B25 | Birds |
| B26 | Mammals & reptiles |
| B28 | Acoustic reflection on marine organisms. |
| B37 | Taggings |
| B64 | Gear research |
| B65 | Exploratory fishing |
| B71 | Particulate organic matter (inc POC, PON) |
| B72 | Biochemical measurements (eg lipids, amino acids) |
| B73 | Sediment traps |
| B90 | Other biological/fisheries measurements |
| D01 | Current meters |
| D03 | Currents measured from ship drift * |
| D04 | GEK |
| D05 | Surface drifters/drifting buoys |
| D06 | Neutrally buoyant floats |
| D09 | Sea level (incl. bottom pressure & inverted echosounder) |
| D71 | Current profiler (eg ADCP) |
| D72 | Instrumented wave measurements |
| D90 | Other physical oceanographic measurements |
| G01 | Dredge |
| G02 | Grab |
| G03 | Core - rock |
| G04 | Core - soft bottom |
| G08 | Bottom photography |
| G24 | Long/short range side scan sonar * |
| G26 | Seismic refraction * |
| G27 | Gravity measurements |
| G28 | Magnetic measurements |
| G71 | In-situ seafloor measurement/sampling |
| G72 | Geophysical measurements made at depth |
| G73 | Single-beam echosounding * |
| G74 | Multi-beam echosounding * |
| G75 | Single channel seismic reflection * |
| G76 | Multichannel seismic reflection * |
| G90 | Other geological/geophysical measurements |
| H09 | Water bottle stations |
| H10 | CTD stations |
| H11 | Subsurface measurements underway (T,S) * |
| H13 | Bathythermograph |
| H16 | Transparency (eg transmissometer) |
| H17 | Optics (eg underwater light levels) |
| H21 | Oxygen |
| H22 | Phosphate |
| H23 | Total - P |
| H24 | Nitrate |
| H25 | Nitrite |
| H26 | Silicate |
| H27 | Alkalinity |
| H28 | PH |
| H30 | Trace elements |
| H31 | Radioactivity |
| H32 | Isotopes |
| H33 | Other dissolved gases |
| H71 | Surface measurements underway (T,S) * |
| H72 | Thermistor chain |
| H73 | Geochemical tracers (eg freons) |
| H74 | Carbon dioxide |
| H75 | Total - N |
| H76 | Ammonia |
| H90 | Other chemical oceanographic measurements |
| M01 | Upper air observations |
| M02 | Incident radiation |
| M05 | Occasional standard measurements |
| M06 | Routine standard measurements |
| M71 | Atmospheric chemistry |
| M90 | Other meteorological measurements |
| P01 | Suspended matter |
| P02 | Trace metals |
| P03 | Petroleum residues |
| P04 | Chlorinated hydrocarbons |
| P05 | Other dissolved substances |
| P12 | Bottom deposits |
| P13 | Contaminants in organisms |
| P90 | Other contaminant measurements |