"Malcolm Nixon" <[EMAIL PROTECTED]> wrote in message news:[EMAIL PROTECTED] : On Sat, 27 Jan 2007 14:55:57 +0000, Bob Adams <[EMAIL PROTECTED]> : wrote: : : : : : this was many years ago, so presumably they are even more controllable : these days, no doubt using modern GPS Nav. system and computer : control. :
They were doing this many years ago. We had a dive ship sitting between two jackets with the stern deck under the bridge for hours at a time. We also had a barge dropping stone into a scour hole right beside a platform again holding position with thrusters controlled by sat nav. To put in prospective how this technology has developed I can also recall helping a team to mount a satellite dish and receiver on a platform and waiting hours to get a 3 position fix as to where we were, (We had been there for 20 years piled into the sea bed) They then put transponders on adjacent platforms so they had their own navigation system for pipe laying etc. -- Brian Ancient Order of Sewer Ants Visit this site and help save our waterways http://www.savethewaterways.org.uk/
