Ok guys
Here is what you need to do to eliminate all 520 memory issues
Connect 520 to laptop
On.mac open the hard drive garmin icon on screen
Click on get info
It will say like 10mb available oit of 110
Here is why
Every time you use the 520 it embeds the gps file into a file hidden which totally uses up all THE memory
After every ride after the session uploads to your phone and garmin connect on.laptop you need to delete the days ride on the 520
Ok
Now ... Open the garmen file
Look for gmapbmap.img
Delete it. On.mac must empty trash
Look for gmapmap sup. Delete it
Nowwww. Scroll down and look for file scm
Open it.. Haaa you will see hugeeee long list of bmap gps files
Delete the scm filetotally
Empty trash
Now tou have 107/110 mb
Wtf didnt garmin know this when I called 5 timessssss
Its not just deleting activities folder
Yes u needto if u dont delete each days session on the unit itself before connecting to laptop
Hope this helps
