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If you already have a map on your unit, you will have both maps. You may have to enable the map on the SD card. At the main menu, press the wrench symbol, then the map icon and then "map info". You should see all of your maps that are available to your unit. Make sure that the square boxes next to each map are checked. Thats how you turn on/off (selct) each map. If the SD card map isn't working, make sure it has a unlock code assigned to the map or it won't work on your unit. Also, the map file name on an SD card is different than the name on your unit. - Jim
reason being you may not have an SD card inserted with maps otherwise your maps have been deleted. try running the map update on the unit and it should reinstall the maps for you... if the SD card is not missing you may have a faulty SD card or SD card slot.
Unfortunately even if you do find a card it will not work with your unit because the cards have to be for that unit.If it is from another unit the codes will not allow it to work. The only option I know of is to purchase your map for that unit and put it on a sd card
the maps are on the 1gb sd card in the side of your c220 unit.
If it's missing, get a 1gb sd card and find a computer that will accept sd cards and your cd that came with your gps, then download the maps from the cd to the sd card.
Your c220 only has 4 states on the unit itself.
The c230 has all the maps on the unit but only 1 million POIs versus 3 1/2 million on the c220
The new maps will be unlocked to your GPS using the code Garmin supplied you.
You will have to add these maps to a second SD card if your present card is full, or else purchase a larger card. Since all the Mapsource NT 2008 Europe maps are 1,395MB in size, you'll need to purchase at least a 2GB SD card.
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