Thanks, guys, for your good help. The "latest map guarantee"... Yes, I thought of that too as one possibility. I'll wait for the upcoming update, due in about a week and if I don't receive it in MyTomTom account then I'll call them. But isn't there a way I can verify on the TomTom site whether or not I did register for the lifetime maps? And if so, how do I get to it?
EDITED to inform that I just found this announcement in MyTomTom:
Announcements
This means, I guess, that I must be registered for receiving the map updates as they become available. And it also means I did NOT automatically get this 910 update which, as I understand it, must have been the second update for 2013, am I correct? As for the March update (or it may have been late February) I received it automatically through MyTomTom account as any other regular update and, again, it may have been the "last map guarantee" you mentioned before. Is there a different procedure for the "quarterly map updates", such as through this announcement posted above that requires specific steps for the user to get them? It seems a little odd to me, but one never knows...
Just one last question: Since version 915 may be just around the corner, is it fine for me to wait for a few more days and then download this latest version or is it necessary to update ALL the versions sequentially?
Thanks once again for all your help and your kind patience.