We know that earth's magnetic field changes its direction over the years so now I want to ask when the direction of earth's magnetic field changes then magnetic declination, angle of dip and horizontal component of the earth's magnetic field shouls also change and if it is true then the magnetic compass would not show correct direction. CAN YOU EXPLAIN IN BRIEF.

Yes, when the direction of earth's magnetic field changes, the given magnetic elements, angle of declination, angle of dip and horizontal component of earth's magnetic field at any particular place on earth's surface, change with time in a systematic manner.The North and South magnetic poles also move widely, but sufficiently slowly for ordinary compasses to remain useful for navigation. Thus, magnetic compass would show correct direction.

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