What is the part of a map that tells direction

The part of the map that provided: north, east, south, and west is usually in a corner of the map.  It is called the compass rose.

Navigation compass or north arrow.

Explanation:

The compass on a map shows its direction in terms of the north and southeast and west. Thus has magnetic properties and get aligned to the cardinal point of the earth, shows 0° north, 180° south, and 90° est and 270° west.  The four-point have a basic wind direction, eight pints have an angular distance to the 45 degrees. And thus form an important component of the amp layout and design and is an essential feature of the direction or bearing. Based on the estimated values of the winds, sun and stars and the gravitational aspects of the earth.

Answera discharge of static electricity;