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Satellites for Offshore Exploration

Published online by Cambridge University Press:  18 January 2010

Extract

While the position fixing techniques employed in offshore drilling and exploration are in many ways similar to those used by the shipping industry—and, indeed, many systems are available to both—there are, nevertheless, several important differences. Accuracy and repeatability are two, in particular, which stand out. It is difficult to state in precise terms what accuracy is acceptable in an offshore survey because the customer is often obliged to accept the best of what he is offered but something of the order of 100 metres is likely to be the target. This is very much better than is required by the average ship out of sight of land or, for that matter, is obtainable in many cases with the instruments available. Repeatability means little to most navigators who rarely have any requirement to return exactly to any position denned in the past. The surveyor, on the other hand, has a continuing need to do this, running lines across his survey grid for check purposes, or at a later date when carrying out another survey or positioning a drilling rig.

Type
Experience with Satellites for Navigation at Sea
Copyright
Copyright © The Royal Institute of Navigation 1970

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References

REFERENCES

1Stansell, T. A. Jr. (1969). Using the Navy Navigation Satellite System, Institute of Navigation National Marine Navigation Meeting U.S.A., November 4, 1969.Google Scholar
2Stansell, T. A. Jr. An Integrated Geophysical Navigation System using Satellite-Derived Position Fixes, Offshore Technology Conference Pre-prints, Vol. II, May 18–21, 1969.CrossRefGoogle Scholar
3Chernoff, J. (1968). Current Developments in Application of Satellite Navigation Techniques to Offshore Oil Exploration, Athens, December 3–6, 1968.Google Scholar
4Chernoff, J. (1967). Shipboard Equipment Requirements for Satellite Navigation and Position-Fixing, a paper read to the Society of Exploration Geophysicists, Oklahoma City, 29 October-2 November, 1967.Google Scholar