It said something about changing maps, etc.
Did you just get the base unit? Any add-ons? Might be interested in the LAMBda.
Does it automatically come with the GPS unit?
It does come with the GPS and it's ready to go as a datalogger/laptimer. The additional sensors will require the data hub because there's only one USB port in the back for information. I.e, if you get the Lambda, you would have to unplug the GPS to use it (without the extra data ports).
As for the "maps", its just another word for modes. Each power mode or TC mode is technically a map just like any other but they are called something different apparently.