I just purchased a new-to-me 2004 Sienna LXE Unlimited yesterday (09/25/12) with the in-dash GPS navigation system. The previous owner tells me the GPS data has never been updated. When I check the version in the menu, it states 03.1. I assume this is the original version that came with the vehicle. I want to update the GPS as it is obviously very old, and there have been many changes in my general area with regards to roadways. My questions are as follows:
1). What is the very latest GPS/map version that is available for my vehicle?
2). What exactly gets updated? Is it just the map data that gets updated (new roads/roadway changes)? Or does it actually update/upgrade the GPS software, as well?
3). Does the latest GPS updates change the view of the maps? The current view on my Sienna's navigation screen is a flat 2D view. I have grown very accustomed to the newer 3D views on late-model GPS devices and apps. Does the map view get updated, too?
4). Are there any software or firmware updates to the the navigation/entertainment system as a whole? The GUI looks very dated. Is there any way to update the OEM unit to a newer, fresher look with added features?
Thank you for any help!