On my Kenwood/Garmin unit, there is a black box for Garmin where the antenna from roof hooks in and the output is a line that hooks up to the back of the back of the radio/display. This black box has an SD card reader that you can update your Garmin. Mine is a 2008, yours is new and it may be different! My Garmin Black Box is mounted just off the floor on the wall near your left foot. I updated the software and the map - I believe the software update was free, but the map update from Garmin was not free - it says how much on Garmin's website.
I hope this helps!
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2008 Newmar Dutch Star 4304
2005 HR Navigator 45PBQ - SOLD
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