[small print: To create a new map you must have a Google account or Signin here when asked. But to use an existing map, no Signin is required.]
When you *create* a map for your group, your group's name will be part of a URL; consider omitting
any spaces and other unusual characters.
There are a few reasons you may find yourself (back) here. For example you may wish to make a new map page but are not an official google account owner ("a user") and you did not become a user when the offer was made; or you may only be trying to access an existing map page, but you entered the name of the group inaccurately.
Signin if you will be creating a map for your group. You will be returned to this page after you signin.