Not a whole bunch. There are some minor firmware differences, and the 550 has a faster USB chip .. a little quicker when loading new firmware or maps.What is the difference between the XXL540 series and the XXL550 series?
Don't worry about the "S". That refers to the "text to speech" feature that pronounces road names, etc. Any 540 or 550 you buy in the U.S. will support that.Also, there are numbers like 540S, 540M and 540TM
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