I have no idea what a basemap is and I read that whole thread. Can I check on the device itself?

My old gmapbmap file has no information about when it was created and the new one is from 2011... so I'm not sure what to do about that.

That's a lot of pois. I don't need custom ones, just the newest normal ones. The file I have that cmae with my device is called D3838100A and it shows a modification date of Nov 16th which was the day I updated to 2015.30. Did it get changed when basecamp installed my map?