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Standard deviation over 2 fixes: a - 0.5 m<br />

Decca error: green 120 m, purple 90 m<br />

Headings of ship on approach to shackle were 190° and 185° respectively<br />

Final shot point position:<br />

Simple average of fixes at deployment and recovery of shot moorings<br />

57°06.984N<br />

aN = .01<br />

+9 m<br />

00045.036Y<br />

a y = .009<br />

+5 m<br />

Depth: 76.125 + .125 m<br />

Closure distances: 44 m in latitude, 8 m in longitude<br />

Closure distance: 45 m<br />

113

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