I inquired of Sony about map updates for my navu-73T after realizing several routes took me way out of the way. I was told "Unfortunately, map updates are not available for your Sony GPS Navigation System at present. If available, it can be purchased from our Parts and Accessories Sales Web site or from the Sony Style Web site. " They provided this site: http://servicesales.sel.sony.com/ecom/accessories/web/index.jsp
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The reason the 125 is cheaper is because it only has the US map on it. Each map contains an activation file that prevents it from being used on different devices, so its doubtful that the other map will work for you. You can purchase the latest Canada/Alaska map from TomTom's site for $59.95.
Go to http://www.tomtom.com/products/maps/
Select your device as the ONE 130 (since they don't have 125 on the site) and choose the Canada/Alaska map.
You could probably just manually delete the Canada/USA maps from the device, and copy over the europe (or whichever ones you need) to the device.
Just plug it in, and view the memory like a normal usb drive..delete the old, copy over the new.
Don't forget to use tomtom home to backup your gps device to your computer first (thus saving your canada maps for later..)
Afterwards, you would probably have to go into your preferences and choose the europe maps.