Question 448Navigation General

The correct answer is C) Isogonic lines. Variation, which is the angle between true north and magnetic north, is indicated on nautical charts through the use of isogonic lines. These are lines that connect points of equal magnetic variation on the chart. Small-scale nautical charts will typically display isogonic lines, rather than a magnetic compass table, to allow mariners to determine the variation in their specific area of operation. The other answer choices are incorrect because: A) Magnetic compass tables are typically found on larger-scale charts, not small-scale charts. B) Variation is in fact indicated on small-scale charts, just through the use of isogonic lines. D) Magnetic meridians are not used to indicate variation on nautical charts.