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If you need to update your maps, check this site for downloading instructions and downloadable ISO files for installing the more current maps. They may or may not be free, depending on your previous map purchases. They also sell the upgrade software, but its a little pricey. They are located in Australia.
Have you updated the unit's software lately? Free unit software updates can be found on Garmin's site. Search for your model as this software is model-specific. There was a new satellite launched in '08 which caused problems for some Garmin units, making some units freeze. The software update fixes this.
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