Hi all, my first post....
Can someone please explain the difference between a locked G2 Vision map and an unlocked one?  I have recently purchased a chartplotter with the EU001R (english channel) map for my boat.  I have also just purchased and installed Garmin's 'HomePort' Software (and just realised I could d/l from within this site for free! 

 ) and I can view the maps from my card  (only fishing chart and nav chart view) on my pc now.  Can anyone tell me why I cant view any of the 3d views please (like I can on my chartplotter) on the pc? 
Am I correct in assuming that a locked map will only work on a gps that it has been assigned too whereas an unlocked map will work on any gps that is capable of reading a G2 Map?
I've noticed that there are links to maps within this site.  Some folk are requesting locked maps and others unlocked maps?  Why is this?
Sorry for so many Q's.
Regards.