Download (6Mb) - NERC Open Research Archive
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Appendix C: Locations of sites at second deployment<br />
Locations as on 29.9.87 when the 4500 lb and 900 lb charge were successfully<br />
detonated and recorded.<br />
(1) SHOT POINT: SHACKLE RING<br />
Class 5 mooring. Fix on shackle ring by approach of Salmaster to ring, locate<br />
ring between horns.<br />
(a) First positioning of shot point.<br />
Beacons:<br />
Fixed at:<br />
VBI, GIR, INV<br />
20.9.87<br />
Depth: 76.25 m (including draught)<br />
Fix: 57°06.972N 00045.032V<br />
a V = .009<br />
+5 m<br />
Accuracy on fix: 20 fixes over 250s, a - 1.5 m<br />
Decca error: green 150 m, purple 80 m<br />
Ship moving to shackle with heading of 80°<br />
(b) Second positioning of shot point.<br />
Beacons:<br />
Fixed at:<br />
Depth:<br />
VBI, GIR, INV<br />
14:02 on 30.9.87<br />
76 m (including draught)<br />
Fix: (average of 2): 57°06.996N 0004S.040V<br />
aN = .003<br />
+3 m<br />
a V = .001<br />
+lm<br />
Accuracy on fix: Seven fixes taken, average of first two accepted while<br />
Salmaster stationary with ring between the horns<br />
(anchor cable tension on buoy created slight movement).<br />
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