Charts Flashcards
True or False?
It is a legal requirement for commercial craft to carry updated paper charts as well as any electronic versions
True
What are the two types of charts?
Raster Charts
Vector Charts
What are Raster Charts?
Scanned copies of original paper charts
What are Vector Charts
Built up from digital information
Where can you find the date on a chart to ensure you are using an up to date chart?
Bottom left
Where can you find all changes over the last 7 years?
UK Hydrographic Office
Name two ways you can update electronic charts
CD-ROM
Internet subscription service from manufacturer
Purchasing a new cartridge for the plotter
What are the three projections used?
Mercator, Transverse Mercator and Gnomonic
What is a benefit of Mercator?
Lines of constant bearing (rhumb lines) will appear as straight lines, useful for steering compass courses
What is Transverse Mercator used for?
Large scale charts and harbour plans
What is Gnomonic projections used for?
Polar charts and planned ocean crossings
What colour is shallow water on charts?
Blue
