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4,11. Fishing (with restricted maneuvrability) 2 cones (apexes together) > 20 m (extra cone: gear extending more than 150 metres in that direction) 5. Not under command 2 balls (vert. line) > 12 m 6. Minesweeping 3 balls 7,10. Restricted in ability to manoeuvre ball, diamond, ball (2 diamonds - safe side to pass) > 12 m (except dive boats) 8.
On nautical charts, the top of the chart is always true north, rather than magnetic north, towards which a compass points. Most charts include a compass rose depicting the variation between magnetic and true north. However, the use of the Mercator projection has drawbacks. This projection shows the lines of longitude as parallel.
A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
The reports for coast weather stations use the following format: name of the station, wind direction/speed, precipitation (if any), visibility in miles, barometric pressure, and trend in pressure. For example, "Machrihanish Automatic. West by south 6, rain, 1 mile, 981, falling more slowly."
He directed the design and distribution of a type of barometer which, on his recommendation, was fixed at every port to be available to crews for consultation before setting out to sea. Stone housings for such barometers are still visible at many fishing harbours. [15] The invention of several different types of barometers was attributed to him.
Sir Francis Beaufort. The scale that carries Beaufort's name had a long and complex evolution from the previous work of others (including Daniel Defoe the century before). In the 18th century, naval officers made regular weather observations, but there was no standard scale and so they could be very subjective — one man's "stiff breeze" might be another's "soft breeze"—: Beaufort succeeded ...
Tide gauges have a practical application in the shipping and fishing industries where low or high tide levels can hinder or prohibit access to shallow bays or locations with bridges. An example is the Cascais tide gauge in Portugal, which was originally installed because of the sand bar in the River Tagus that causes difficulties for shipping ...
Weather stations typically have these following instruments: . Thermometer for measuring air and sea surface temperature; Barometer for measuring atmospheric pressure; Hygrometer for measuring humidity
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