Cruise inventory

RRS Discovery D68

Cruise summary report

Cruise Info. 
Ship name (ship code)RRS Discovery (74E3)
Cruise identifierD68
Cruise period1974-11-01 — 1974-12-15
Port of departureBarry, United Kingdom
Port of returnBarry, United Kingdom
ObjectivesThe itinerary was planned to enable a number of shallow and deep tidal pressure sensors to be laid on an L-shaped plan consisting roughly of the 10 meridian from west of Ushant to west of Cape St. Vincent, and the 37 parallel between Cape St. Vincent and the Azores. As usual this required an initial period for laying sea-bed capsules and two shallow current meters, and a final period of recovery on the return voyage (Legs 1&3). The intermediate period (leg 2) was used primarily for geophysical seismic profiles and magnetometric/bathymetric surveys northeast of the Azores, for testing various pieces of mechanical and acoustic equipment by the IOS-W engineering and applied physics groups and some tests of disposable containers for the UK Atmoic Energy Authority.
Chief scientistDavid E Cartwright (Institute of Oceanographic Sciences Bidston Laboratory)
Cruise reportRRS Discovery D68 cruise report d68.pdf — access key 'C' (12.19 MB) 
Ocean/sea areas 
GeneralNorth East Atlantic Ocean (limit 40W)
Track chartsRRS Discovery D68 cruise track — trk1635.html
Physical oceanography 
CTD stationsQuantity: number of stations = 1
Current metersQuantity: 2
Description: 40 days
Sea level (inc. bot. press., inverted echosounder)Quantity: 6
Description: (30 Days)
Other physical oceanographic measurementsQuantity: number of profiles = 2
Description: sound velocity stations
Biology and fisheries 
ZooplanktonQuantity: 8
Description: survey distribution, population etc.
NektonQuantity: 16
Geology and geophysics 
Multi-beam echosoundingQuantity: track kilometres = 11112
Single channel seismic reflectionQuantity: track kilometres = 2963
Magnetic measurementsQuantity: track kilometres = 6667.2