A map's orientation is typically determined by a/an

A. Legend
B. Grid pattern
C. Index
D. Compass rose

A map's orientation is typically determined by a Compass rose.

Option: (D)

Explanation:

A compass rose is also known as a wind rose or ‘rose of the winds’. It is used to term for the graduated markings found on the ‘traditional magnetic compass’.  

A figure on a compass, map, nautical chart, or monument used to display the orientation of the primary directions, east, west, north, and south and their intermediate points.  

A map indicates the real world. By orienting a map, we are positioning to the direction North is actually pointing north.  

When we orient a map and know where you are on the map, you can look in a certain direction and see a real landmark and find it on the map.