Final answer:
When on the outbound leg, you would apply the same amount of correction as the inbound leg but in the opposite direction. In this case, the outbound drift correction would be 70 west.
Step-by-step explanation:
When determining the drift correction for an outbound leg, you would apply the same amount of correction but in the opposite direction. In this case, since the inbound drift correction is 70 east, the outbound drift correction would be 70 west. This means you would need to correct your heading by 70 degrees to the west.