Question 670Navigation General

The correct answer is A) the magnetic equator. The magnetic equator is the line that connects the points on the Earth's surface where the magnetic dip angle is zero, meaning the Earth's magnetic field is horizontal at those locations. This is because the magnetic equator lies at the intersection of the Earth's geographic equator and the magnetic equatorial plane, where the magnetic field lines are parallel to the Earth's surface. The other options are incorrect: B) a magnetic meridian is a line of constant magnetic longitude, not the line of zero magnetic dip; C) an agonic line is a line of zero magnetic declination, not zero dip angle.