Why is it important to understand if a map direction is based on true north or magnetic north?

Its important to understand the difference between true north and magnetic north because true north is a fixed point on the globe. Magnetic north is the direction that a compass needle points to as it aligns with the Earth's magnetic field.

Explanation:

This is an acceptably correct answer

the navigation act prevented the colonies from exporting to countries other than britain and it prevented the importation of goods by other countries as well. so i believe the correct answer is d. other nations could not deliver goods to the colonies.

hope this .

d. it adversely affected american productivity