Registration enables you to markup maps with your personal route information. It also enables you to save photos, trip notes, links, and gps tracking data.
When registering, a cryptographically secure "this-is-me" code is generated and saved internally for your specific device. After registration, no further login is required so long as you use the same device. Note: the "this is me" code is stored as a cookie so if you remove cookies, you will have to re-register.