Alex is spot on.
A RBI does NOT always have your heading on top - you are thinking of an RMI.
Example 1 = HDG North, (fixed card) RBI shows beacon behind aircraft with relative bearing = 180°. Only possible option = top left aircraft in position 1.
Example 2 = HDG South, (fixed card) RBI shows beacon behind and left of aircraft with relative bearing = 225°. Only possible option = bottom right aircraft in position 6.
We know it's (probably) a fixed card RBI as it shows 0° at the top. If it was an RMI it would display the aircraft heading at the top. A moving card RBI can display the heading at the top but this is manually adjusted on completion of a turn.