Most plotters and GPS units allow the user to select the appropriate datum. Confirming that the datum in use and the datum on the electronic/paper chart are the same should be routine.
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There is a tide in the affairs of men,
Which, taken at the flood, leads on to fortune;
Omitted, all the voyage of their life
Is bound in shallows and in miseries.
Shakespeare, Julius Caesar IV, iii, 217
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