The old ASR files won't be any use unless you plan using the old map they are related to. They are just taking up space so better to delete them. While you are at it, delete the old JCV file. Each map update will have new ASR, JCV and 3d files. Also you should update the G2S and SQlite folder/files for 'complete' update. Again, the 'older' files can be safely deleted.
G2S Path: ".System\G2S"
If you don't have the folder simply create a folder and name it G2S.
No it is not a MUST. The GPS will work but you will not have the MYTRENDS feature.
With myTrends, when you save your regular destinations in your “Favorites,” your nüvi Garmin will, over time, begin to figure out where you’re going even without your telling it
Bookmarks