The first thing you want to do is download the waypoints you already have on your GPS. Then you can compile them in one file with the new ones you want. Then you can delete all the waypoints on your GPS - there's an option for deleting them all at the same time - and then upload the new file. Each time you make a file be sure and save it with a different name so you can always go back and get any waypoints you have from them. When I backup my GPS a make the file name the current date so I alwasy know what which one is my most current file.


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