@Plumbers Crack asked me to find some info on the radar so I have some basic information on how it works. Underlying though it states it works similar to how the Destiny radar does.
For Shapes:
Large orange circle: An enemy pilot
Small orange circle: Enemy AI controlled entity (other than titan)
Orange arrow: An enemy titan
Q. A whole 1/8th of the circle can be colored in the enemy color (orange). What does this mean?
Q. Sometimes, a faded orange circle will appear around a section of the map, which may or may not have anything to do with map objectives. What's this for?
Q. Sometimes the outer ring of the radar has solid colored in orange sections. What do these indicate?