I have downloaded the CN North America NT 2011.40 unlocked from a different site.
Loaded on a SD card and works perfectly.
With the download came a new gmapbmap.img (basemap) and a gmaptz.img ( time zone).
The gmapbmap.img is huge 49,824 KB. I'm wondering if it safe to load this file on my Nuvi 680.
My basemap file is only 6,056 KB
The last time I tried to update the basemap I got a failled message when I did a diagnostics check.
Of course I backed up all my files so I just copied the old one back, did a test and it passed.
I'm curious to know why this basemap file was included with the new map. Any thoughts or suggestions if I should install the file.