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The Accuracy Contours of a Running Fix

Published online by Cambridge University Press:  18 January 2010

Y. Namikawa  and
Y. Yamazaki
Y. Yamazaki
Affiliation:
(Kobe University of Mercantile Marine)
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Extract

An accuracy contour can be defined either in terms of a locus of constant radial error or a locus of constant probability density. A short comparison of the two concepts is given in reference 3.

The object of this note is to define contours of constant probability density in the case of a two-position-line running fix; the outcome is of interest in that it enables the navigator to plan his observations so that the accuracy is optimized. In Fig. 1 the object observed is S. The transferred position line corresponding to the first observation is drawn from the point S′, where SS′ is the vector corresponding to the ship's run during the time between the two observations. The fix is at O.

Type
Research Article
Information
The Journal of Navigation , Volume 22 , Issue 2 , April 1969 , pp. 169 - 171
Copyright
Copyright © The Royal Institute of Navigation 1969

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References

REFERENCES

1Jessell, A. H. and Trow, G. H. (1948). The presentation of the fixing accuracy of navigation systems. This Journal, 1, 313.Google Scholar
2Samishima, N. (1954). Accuracy contour maps of a ship's position. This Journal, 7, 392.Google Scholar
3Parker, J. B. (1954). Accuracy contour maps of a ship's position. This Journal, 7, 395.Google Scholar