same problem in Australia
Will not show anything in myMaps (locked or unlocked)

Not even when i add a vehicle it will not show up

Donjt know??

iPhone 4 jailbroken
I think you may need the purchased app for it to work

Got it going

Each file i transfered to the divice required the Ownership & permission to be set to

Ownership:
Owner: mobile; Group: mobile

Access Permissions:
User: Read, Write, Execute
Group: Read, Execute
World: Read, Execute

THX heaps Garmin iz da best