Install the nav desk software to you p.c and connect the navman to the pc via the usb cable.
You will be prompted that a map upgrade is available through the NavDesk software. Once the unit has synchronized with the NavDesk software you will be informed that a later map is available. Once you select the map data, it will begin to download to your computer.
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http://www.navmansupport.com.au/Navman%20FAQs/Map%20Installation/MY%20Series/MY80T/Map%20Installation%20Instructions/MYBase041___400.htm
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