If this becomes a creature because of an effect other than its own ability, its last ability will still trigger whenever it attacks.

Map tokens are a kind of predefined token. Each one is a colorless artifact with the artifact subtype Map and the ability ", , Sacrifice this artifact: Target creature you control explores. Activate only as a sorcery."

If this becomes a creature but you haven't controlled it continuously since your most recent turn began, you won't be able to activate its mana ability or attack with it that turn.