In the UK, they introduced 3D buildings to the maps about 5 years ago, but they were never terribly impressive just slight "humps".
Also, they ONLY drew them on the maps for the centre of a few of the biggest cities. My route into work crossed the "border" between flat and 3D, just near Putney Bridge and it looked odd on screen as you went across.
There was never any way for a user to switch it on or off.
BUT, they scrapped the whole idea again a couple of years later, so buildings now just seem to have a slightly browner "patch" around them sometimes (depending on your selected colour scheme).
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In regard to your PM about where to find new colour schemes. There are two main ways.
1. If you still have access to an old TomTom that uses "Home" to connect to the internet, you can use that to access TT's own library of colour schemes that people have made. You can then copy the colour scheme files over to your Go1005 as explained below.
2. Alternatively, you can find them on the web.
You can try Googling for them, but probably by far the best place to find them is here:
http://www.colorschemeeditor.com/index.php?lang=EN
As well as having several pages of colour schemes that you can try (use the tabs "schemes 1", "schemes2" etc.), it also has a free downloadable editor program which helps you to make your own! (if you get REALLY keen...)
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Installing them...
Once you have found a colour scheme you like from somewhere, the actual file you download is a simple text file called something like "my_nice_scheme.clr".
The .clr extension is what TomTom's are looking for.
Save that file (or several of them) somewhere on your PC where you can find them again.
To add them to your Go1005, you connect the Go to your PC with the USB lead, then run the MyTomTom PC program.
Once that is running you click on the red TomTom icon near the PC clock and in the small window that appears, select "Add community content"
That will open a new browser page where you can add POIs, Voices, and other stuff, including the colour schemes. Like this:
When you click on "Add Colour scheme" a standard File selection window should open allowing you to find those files, wherever you saved them on your PC.
Follow the steps to upload them, and that's it!
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To get the TomTom to use the new scheme, disconnect the TomTom from the PC again, and go to the "Settings" menu.
Somewhere in that menu (page 3 on mine) there's a setting for "Map colours". Tap on that and you get asked which colour scheme you want to use for 3D view in the day, 3D view at night, 3D view - day and 2D view - night. For each one, you have to scroll through all the available schemes to find the one you want.
Any new schemes that you've added tend to be right at the end of the list, so be prepared to scroll through all of the built-in schemes first.
Hope that gives enough detail to get you on your way!