When you set your status to "Taking Offers" in the Grubhub for Drivers app, you need to be in your market’s delivery boundaries to be sent offers. Once you are located within the delivery boundaries, the app will send you offers.
To ensure that you receive as many orders as possible during your block, stay within the delivery boundaries until you are finished delivering for the day.
The delivery boundaries are accessible in the app. You can find the boundaries by clicking on the bars in the left hand corner and then selecting “View Region Boundaries.”