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Check the map menu to see if the new map is on the unit. At the main
menu, press the tools button then the map icon. Then press the "map
info" button. Look to see if the listing shows the new map that you just
downloaded or if the original older map is still there. Make sure that
the map is enabled by a check mark next to the map listing.
Probably the gps antenna is not working due to rusty (water inside it). Check the antenna disassembling it. Third part antenna for the NT1 is not available due to proprietary connector so you must buy a (expensive) genuine new one from JVC. Sometimes it's possible repair the old one.
You need to upgrade your mapping system. Go to www.garmin.com to find the appropriate upgrade for your particular GPS. Try google-ing "free map upgrade for garmin nuvi 205w" and check to see if any free upgrades are available for it.
It appears that this problem was a case of non-backwards compatability with maps to application versions. My gps was on v8.02 application which was not compatable with the v8.15 series of maps. I had to remove ALL the software off the gps, allow it to rebuild using TomTom Home up to v8.300 and then re-load the v8.15 maps. This then stopped my older maps from working.......
I can see this working in a commercial sense; ie every time there is a gps version update everyone will need to purchase new maps, but jeez it's bloody frustrating!!
From your Where to?/View map screen press on the box wrench to access the settings menu. Once at the settings menu press Map, then press Map Info and you should see that you have City Navigator North America NT v8 or whichever one is loaded.