I wrote a tutorial on deleting unnecessary files to free up space. I think many people will find it helpful. I welcome your feedback and comments.1490T Tutorial 2. Notes on deleting unnecessary files to free up space. And, notes on other files. This tutorial, and others, is stored on my Microsoft SkyDrive Account.To open this tutorial, click the link below, then click the name of the tutorial.http://cid-c6483e8a197b8356.office.live.com/browse.aspx/.Public/nuvi1490T/TutorialsI have a Garmin nuvi 1490T (2GB internal memory). After deleting unnecessary files, I was able to install the "2012.20 Full Coverage of North America" map update to internal memory, and still have 96MB free. Initially I installed "2012.20 Lower 49 States" to internal memory, and installed Alaska, Canada, and Mexico as a supplemental map on my device's storage card using MapSource. While this approach takes a few more steps, it supplies the full map and when using the device I can't tell the difference.My 1490T notes will (AFAIK) apply to nuvi 13xx/14xx (they use same firmware) and nuvi 1xxx, and parts at least to other nuvi models.