Use gmasupp file
Do not use mapsource program to install your maps.
It's prone to failure and pain in the butt. Also very slow.
You will be given several choice of files to download.
Choose gmasupp file,, simply extract one file then make a directory called Garmin/ on your SD card,, simply copy and paste the file under it and boot up.
Your unit will recognise the map.
As for the GPX file, for waypoints ,,I find it must be on the main memory under Garmin/GPX/.
Takes 10 seconds.
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