That 1.36GB could explain your basemap and preloaded US map missing from your .system folder as shown in the [Only registered and activated users can see links. ]. If you copied it before you deleted it or if you have a backup, have a look to see what's in it. It's a fair bet the time & date of the .CHK files will coincide with you having not safely removed the nuvi from your pc, or an aborted update attempt through WebUpdater.
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