Yes Mr.X it is all voluntary. I'm not even the one who added the members that are on the map. You have to add yourself if you want to be on it.
I don't track any user identifiable information of the members. The only information I ever collect is their email address, and that is just to make sure they are a legitimate person before granting them access rights to post. I don't track IP #'s either. The message board software does record the last IP# you post from, but that is all...and I have no interest in knowing. (I don't even care if users decide to post through an anonymizer proxy service

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Mark