8. A hazard is reported by the Coastguard in position: 178°(T) MacArthur lanby 2.40 miles a) What is the depth shown on the chart in this position?


9. Use Chart 3 to find the latitude and longitude of the buoy or beacon in these positions: a) 234°(T) Holm Point light 7.7 miles. b) 337°(T) Holm Point light 2.80 miles.


10. Paper charts and electronic charts can become out-of-date when changes are made to lights or buoys or new surveys show that depths have changed.


Where can information about chart corrections be found?


11. Charts are constructed from surveys. The type and age of survey may affect the quality of the data. Take a look at Dawson Harbour on Training Chart 4A.


a) What date and how was the survey data collected? b) How reliable is this data?


12. A leisure chartplotter usually displays a warning when it is switched on. What does this mean for its users and how they use electronic charts when navigating?


13. Chartplotters include a settings function that allows the user to customise aspects of its operation. The chartplotter in the snapshot is being configured for use with the paper Training Chart 3.


a) Identify three changes to the units settings that would better match the chartplotter to the paper chart.


b) Suggest an advantage to displaying bearings in °True and an advantage to displaying bearings in °Magnetic.


c) Suggest an advantage to setting variation to automatic.


14. What is represented by the following lines or symbols on this particular chartplotter screen: a)


b) c) d) e) f)


15. Compare the differences caused by setting the level of chart detail to low or high as shown on the split-screen display.


a) List five pieces of information that are not shown on the low detail chart that are shown on the high detail chart.


b) Compare the number of North Cardinal Marks (NCMs) that are shown to the north of Louisa Rocks on the high detail chart, on the low detail chart and the number shown on Training Chart 3. Explain the reasons for the differences and how you would address this when using a chartplotter for navigation.


c) Would the number of NCMs displayed on an electronic raster version of Training Chart 3 change according to the level of zoom? Explain your answer.


d) Other than setting each half at different zoom levels, in what other situations might setting a chartplotter to split-screen be a useful option?


C A


B


D


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