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... the data logger, a left/right indicator, used when manual steering was employed, and an autopilot for automatic operation, with the surveyor presetting requirements. ... the British Geological Survey) required to carry out a bottom survey of the area around the proposed Severn Barrage in late 1980. ... Sample sites were based on a 1 km grid, position fixing being by triangulation, using a Motorola system.

Author: Society for Underwater Technology (SUT)
Publisher:Springer Science & Business Media - 2012-12-06

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