By Tim Bartlett
The Adlard Coles publication of Navigation is the precise reference for somebody following an RYA navigation path, from Day Skipper via to Yachtmaster Offshore and for any seafarer requiring a data of navigation. This hugely useful publication explains every thing the reader must understand to navigate a yacht or motorboat from one port to a different competently and competently. utilizing transparent diagrams, labored examples and color images all through, Tim Bartlett explains every one level of navigation, together with digital navigation.
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Additional info for The Adlard Coles Book of Navigation
Example text
One or more waypoints that you intend to pass through in a particular order is called a route or sail plan. Some of the simplest navigators demand that you enter the waypoints in the correct order, but most allow you to pick, choose and rearrange. This is particularly useful for racing boats whose (human) navigator can store the lat and long of all the local race marks in his (electronic) navigator’s memory at the start of the season, and quickly assemble the relevant ones into a route when the course is displayed at any time up to the five minute gun.
This involves taking the boat to an accuratelyknown position, then turning it round to point straight at each of several distant landmarks in turn. The true bearing of each mark can be found from the chart and converted to a magnetic bearing by applying variation. Comparing the known magnetic bearing with the corresponding compass heading gives the deviation. If the compass heading is less than the magnetic bearing the deviation is named east; if the compass bearing is the greater the deviation is named west.
It may be tempting to use this to guide the boat back to the spot at which the casualty fell overboard, but you should bear in mind that by the time you get back to that spot 45 The Adlard Coles Book of Navigation take the latitude and longitude readout, and plot them on a chart, but this involves manipulating parallel rulers, dividers and a pencil – and this, in itself, can be difficult in bad conditions. An alternative is to use some of the other functions ‘backwards’. Fig 32 Small errors in successive position fixes (represented by the shaded circles) affect the accuracy of an electronic navigator’s course and speed display.