Click the HD 100 Service Plan Renewal button, then click Renew Service Plan.
Enter your activation code. (If you purchased the renewal at a truck stop, the code is located on your receipt or card. If you purchased at randmcnally.com, the code can be found in the activation email.)
Six months of service will be added to your service plan. The expiration date in the top right-hand corner of the Dock will be adjusted accordingly.