The short answer is: Yes.

In order to receive notification emails, competition invites and other items, we require people to use their own email addresses.

If your email address is already being used by an account, the system won't let you use that email address to register another account.

If you don't have your own email address - we recommend getting a free email address from Gmail.

Advanced users tip:

If you do use Gmail, you're welcome to use 'plus addressing' to register multiple Walker Tracker accounts. 

Read about plus addressing here.