Can any one help i need to find the answer to the following question

"To determine the azimuth of an object relative to the witness, one would use:

1. a calculator

2. dead reckoning

3. Global positioning

4 a compass

5. Calligraphy

I know you can determine the azimuth of an object by using a compass, what else however from the list can be used.

Any help would be appreciated.