Changing maps already installed

have you downloaded software to talk to tom tom device and the web site for tom tom
http://au.support.tomtom.com/app/answers/detail/a_id/12493/~/installing-mydrive-connect
don't know if maps are free
http://uk.support.tomtom.com/app/answers/detail/a_id/15230/~/changing-map-on-navigation-device-with-computer

some TomTom models do not have enough space to store all the possible maps you can download. You will probably have to remove your current map in order to install the Florida map. The TomTom utilities should tell you how much is need/available.

Yes but won't be a very useful exercise. Because, you will have to purchase a new map of India, install it (provided you have an SD card slot) or install it to the hard drive (provided you have the space) and switch the maps. Very easily said than done. Most important of all, I do not think, Tom Tom offers a map of India. It would be best to buy a cheap one that comes with mapmyInida maps pre-installed. My one suggestion would be look for a GPS where you can navigate by latitude and longitude input as an option. Since most towns/rural areas do not have street/Avenue intersections, locating your destination in Google and feeding that lat/lon to your GPS would enable you to use your GPS far better in those conditions. If you travel in Inida with a GPS on Lat/Lon inputs, I would definitely like to hear your experience. Send a Personal Message on [email protected] please. Check out Mapmyindia.com. Garmin seems to have India maps and GPS in the Rs. 8000/- range. Costlier compared to US prices though.

Yes you can I have europe and canada on mine.

just plug your tomtom into your computer and start tomtom home

On the computer screen for tomtom select ADD MAPS

Here you can select and buy the maps you need.

Once you have confirmed the purchase you will be given instructions on how to download etc

Some maps may take a little time to install to the tomtom itself.

you should also ensure there is enough space on your tomtom
If not you will have to get an SD memory card.

I use a 4gb one that still has lots of room to spare

you may have run out of memory for the full map, your device can use a 2Gb max SDcard which should be enough for all your maps. It will have put placeholder there and tryed to drop the full map but you can only see the bit it could store to the memory.

You can back up all your current maps and install North American maps for Florida using TomTom Home. You can switch back to European maps when you get back to the UK as well- I used my TomTom Home to manage my GPS and I find it can be very useful in situations like that

Unfortunately there is only a limited amount of space on the ONE. You can back up your Tele Atlas maps on a laptop using TomTom Home. As long as you have your maps backed up in TomTom Home, you'll be able to install each set of maps on the fly. It may seem like a hassle, but it's better than having only one set of maps

Can you tell me . After you installed the Western Europe map , did you at any time activate it ? ie , did you have to enter an authorisation code ?

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.
Good luck!

yon should have a reset button on your system but by connecting to the computer shouldn't have changed anything unless you made a mistake and set uo the wrong map.