Microbiological contamination consisting of bacteria, yeasts and moulds, are easily tolerated at low contamination levels. It is only when their numbers are not controlled that rapid infestation occurs. From a marine point of view there are six main areas of concern for microbiological infestation. Modern lead-free gasolines contain water soluble oxygenates such as methyl and ethyl alcohol, methyl tertiary butyl ether .

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Dynamic Positionning systems allow a vessel to remain at a fixed point independent of the influences of the environment. This is achieved by a system of reference points, sensors and propulsive power units. The reference points determine the vessels position relative to a datum, they do not necessarily determine the vessels exact location on the earths surface- only DGPS attempts to do this.

These fall into the oldest class of governors whose history goes back to the invention of the steam engine. The governor assembly is directly driven from the engine. Flyweights are rotated and act to draw the slide up the drive shaft due to centifugal force pushing them out.

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