... down to 2-5 m for multi-pass positiomg. The Global Positlorung System (GPS), whch is due to replace Transit at the end of the current decade, is capable of quasi-mstantaneous posi- boning to an accuracy of 10-20 m, w t h hgher accuracies obtamable from observations over a longer interval. The US...

... and positiomg systems is considered. The de- velopment of mcreasmgly comphcated navlga- bon and positionmg systems is exammed to hghhght common features such as hgh data capture rates, sensor diversity and hgh proces- smg loads. It is these factors whch make transputer technology particularly appropnate...

...- ance dynarmcally w t h X-band m a slmilar fashon?" Certamly! An Apple 11th computer was set up w t h three senal ports so that measurements from the UHFB system would enter the computer regularly at a three-second update, after whch a tngger would be sent to the X-band system so that a second set...

... exposed to the North Atlantic. Swells with periods in the regon of 20 s and heights over 5 m have been measured. In fact, based on these observa- tions, a research project is now in progress whch alms at lmprovlng the modellmg and forecastmg of swell on the shelf. The ODAP data are used for calibration...

...) and of hght weight (about 10 kg in air, with sensors). The vehcle is equipped w t h conduc- tivlty, s h t y and depth sensors. The vehcle motion is controlled from a deck control umt. The USV scans the vertical plane m whch the tow cable advances horizontally, and measures the dstributions of those parameters...

... of recently designed components such as CCD cameras, low power consumption microprocessors and high-efficiency wide-band amplifiers led to a compact instrument whch can be used in a wide range of applications and which can be installed in manned or unmanned submersibles or in deep sea structures to control...

... offshore flather distnbution tide estlmate offshore site reference site surge current water level usmg north sea whch elevation surge tidal current surge elevation penod pugh constituent tidal level Estimating Extreme Still-water Levels and Currents Offshore Graham Alcock...

... propagation wave model october 1983 wave spectrum equation forecast global wave model mean frequency wave height spectrum frequency spectral shape representation hasselmann wave field komen source function evolution whch resolution Activities of the WAM (Wave Modelling...

... whch field trial receiver helmsman sonar resolution storage subsystem benigraph positiomg platform field tnal beamformer processor accuracy fish attitude frequency kalman filter The Benigraph Surveying System: Results of Field Trials Erzk Hammerstad, Arne Louzk, LezfKrane...

... techmques, for n g and platform site surveys and have changed httle. With the commencement of dnllmg at Magnus m e n t , BP considered final dnllmg plans for whch the presence of shallow gas sands was mportant. From the 15 well logs avadable for the area, it was apparent that there were two particular sand...

... sealion battene reservoir characterization kevlar cable penetration full penetration water depth situ geotechnical testing sensor test rod whch cable transducer upstream oil & gas piezocone seahon dc motor snellius-ii expedition automatic system retraction Sealion...

... the sedment is defined as the difference between the actual pressure and the hydrosta- tic pressure at the depth of the measurement.) To acheve ths , a pore-pressure port has to be mserted mto the s e h e n t s on a lance whch inevitably causes some disturbance. A pressure pulse wdl be generated whch decays...

... but the broadest sense, to a depth survey. It is selective m what it shows, dependmg on the scan aspect to a feature or target. Sidescan sonar, used w t h caution, is a diagnostic tool, 1.e. it can mdicate the presence of a somethmg whch requlres further exammation. Therefore, m one respect, it has tended...

... is an expensive and tune- consummg matter dunng whch every effort must be made to prove (or disprove) the reported feature conclusively; o themse a great deal of money and resources wdl have been expended to no purpose. The International Hydrographic Organization has recently made a study of how best to ensure...