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www.seadiscovery.com Marine Technology Reporter 39 500 m wide and 12 nautical miles long in Luce Bay,

Scotland. The data collected was to be used to verify his- toric data and plan MCM operations before an amphibi- ous landing. HUGIN I completed four successful mis- sions in 48 hours, operating the vehicle on a tight sched- ule: To maximize area coverage in the shallow water (10- 30 m), each mission was performed during the six hours of highest tide, while the batteries were recharged during the six hours of lowest tide. The vehicle also had to com- bat tidal currents of up to three knots. While the AUV primarily operated autonomously, the mine hunter was usually locat- ed within a few nautical miles of

HUGIN I. Two-way acoustic communication was available at up to 2-3 nautical miles in very shallow water. Data from each mission was brought to shore for immediate processing on a provi- sional shore lab set up by NURC (NATO Undersea Research

Center). In the days following the

AUV operations, data was processed further at FFI in

Norway and NURC in Italy. The end result, a set of AML (Additional Military Layers) files, was then transferred to the exercise headquarters in Northwood, UK for use by

MCMVs during the clearance operation.

Bathymetry of part of the amphibious landing route sur- veyed by HUGIN I for Northern Light 03. Grid spacing 1 x 0.5 ft., water depth 14-32 m. The green lines indicate the area to be surveyed, 6 nmi x 500 m; white lines indi- cate HUGIN's trajectory. 2003 MCM demo, Finland

Less than two weeks after

Northern Light, KNM Karmøy

The US submarine Nautilus sunk outside Bergen in 1931. This image, using side scan imagery draped over multibeam bathyme- try, was produced with the Triton

Imaging post-processing software on the mine hunter and transmit- ted to the US 2-3 hours after AUV recovery.

HUGIN 1000 being launched from KNM Karmøy in the Baltic Sea during its 2004 deployment in MCMFORNORTH.

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