Seitz 555

As the title says, is there a way to transfer the data from my Garmin to the GPS system on my 2021 Denali ?

First I'll start off by saying I really like my new Denali. I had the dealer install the bed cover mentioned in the subject title and where the hard cover sets on top of the tailgate, you could throw a brick thru the gap. Not really, but there is a gap along the top of the tailgate from a quarter to 3/8 of an inch the full length. There are 3 weatherstrip bands along the bottom side of the cover but they don't engage the tailgate, they set back inside the bed. Was wondering what anyone has don't to their's to correct this problem. Thanks for your help in advance