yes it does ask any revo dealer
You are confused
With REvo, not sure about any other map, if the battery is disconnected for a long period of time, (not sure? over an hour or something?) the revo settings will revert to 0 - 0 - 0 (timing, boost, fuel). The map is still there, but the settings have reverted to zero. i know this as it happened on my car, and spoke to Revo about it personally.
I doubt this will be a problem with other maps.