Unknown: Atlantic

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Alternative Names Sumburgh Head; Fair Isle; Dunrossness; Obstruction
Site Type OBSTRUCTION (POSSIBLE)
Canmore ID 102939
Site Number HZ39SW 8001
NGR HZ 31039 91313
Council SHETLAND ISLANDS
Parish MARITIME - SHETLAND ISLANDS
Former Region SHETLAND ISLANDS AREA
Former District MARITIME
Former County NOT APPLICABLE
Datum WGS84 - Lat/Long
NGR Desc HZ c. 310 913
Latitude N 59 42.3714
Longitude W 1 27.012

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Archaeological Notes

HZ39SW 8001 c. 310 913
N59 42.4 W1 26.9

NLO: Sumburgh Head [name: HU 407 078]
Fair Isle [name centred HZ 21 72].

Formerly entered in error as HZ19SW 8001 at cited location HZ 1078 9119 [N59 42.4 W12].

Quality of fix = PA
Horizontal Datum = OGB
Buoyage =
General water depth = 80

Surveying Details
-----------------------------
16 May 1984. An uncharted obstruction was reported in a position bearing 211 degrees, 10.4 miles from Sumburgh head. The obstruction was found when towing the oil rig DYVI OMEGA on 23 March 1984, when the obstruction was fouled and the tow-wire parted.
Report by MV TENDER TRACER, 23 March 1984.

Note: The catenary of the tow was 35 to 40 metres.

22 January 1985. An area of 30 square miles was searched, using echosounder and side scan sonar, with no indication of this reported obstruction.
Report by Naval Party.

Hydrographic Office, 1995.

The obstruction was inserted in 59 42.4N, 01 26.9W [OSGB 1936] by NM 1450/84.
Information from Lieutenant Commander N McEachan, Royal Navy (Wrecks Section, UKHO), 25 November 2009.

(Re-entered as HZ39SW 8001 at cited location HZ c. 310 913). This location falls about 19km SSW of Sumburgh Head and the same distance NNE of Fair Isle.
Information from RCAHMS (RJCM), 25 November 2009.

19 April 2012
 REFERENCE

Project Project Adair - UKHO data upload.

Notes UKHO Identifier : 000550
Feature Class : Obstn
State : DEAD
Classification : Unclassified
Position (Lat/long) : 59.70667,-1.44833
Horizontal Datum : ORDNANCE SURVEY OF GREAT BRITAIN (1936)
WGS84 Position (Lat/long) : 59.70619,-1.45020
WGS84 Origin : 3-D Cartesian Shift (BW)
Position Quality : Approximate
Depth : 35.0
Depth Quality : Value reported - not confirmed
Water Depth : 80
Water Level Effect : Always under water/submerged
Vertical Datum : Lowest Astronomical Tide
Reported Year : 1984
Name : Obstruction
Type : OBSTRUCTION
Contact Description : None reported
Original Sensor : Physical Snag
Original Detection Year : 1984
Original Source : Merchant Ship
Surveying Details : **H3057/80 16.5.84 UNCHARTED OBSTN IN POSN 211 DEG, 10.4M FROM SUMBURGH HD. FOUND WHEN TOWING OIL RIG DYVI OMEGA ON 23.3.84, WHEN OBSTN WAS FOULED AND TOW-WIRE PARTED. (MV TENDER TRACER, HN 23.3.84). CATENARY OF TOW WAS 35 TO 40MTRS. INS AS OBSTN 35MTRS. - NM 1450/84.
**H2929/83 22.1.85 AREA OF 30 SQ MILES SEARCHED USING E/S & DCS3. NO INDICATION OF THIS REPORTED OBSTN. (NP 1008, HI 208). DELETE - NM 302/85.
Chart Symbol : OB PA 35.0 Rep(1984)
Date Last Amended : 09/03/2004

Further details

Charity SC026749