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If you have lifetime maps, download Garmin Express for Windows or Mac, make sure GPS is fully charged, connect to computer. Let Garmin Express find GPS, do a complete backup, and then do a most recent map update. If you do not have lifetime maps you will have to purchase new maps from Garmin.
I just purchased my c530 a couple of days ago and had been loving it. I had added some custom POI's to my sd card using POI loader version 2.4.0 and that had worked fine. Then the other day I tried to load some new custom POI's, but POI loader got hung up and froze. After disconnecting the c530, I restarted it. After it started, a screen came up that said "No detailed maps found that support routing. The Streetpilot cannot be used without them." I contacted garmin, here is the site for contact info since I am unsure where you are. http://www.garmin.com/garmin/cms/site/us/support/supportcontactand the tech support at Garmin. They said that somehow the files on my c530 must have gotten corrupted. The person I talked to at Garmin was very friendly and walked me through several things trying to get my unit to work. He was very apologetic and said that this should not have happened. He told me I would have to return it and get a replacement. Sorry Hope this helped.
Don't believe everything you see on a GPS.
Garmin does not update their maps as they should; I found this even after I purchased their map update. I drove 48 states in a big rig, over many new roads not found or shown on the Garmin maps. My streetpilot usually went into a hiccup mode, recalculating -- recalculating -- recalculating. All the while, it tried to get me to detour on whatever spurious local roads happened to show up along the way.
I just got this from the Garmin support guys. You won't believe how easy. From the main menu, click on the wrench, then map info. That should tell you what version of the map your Garmin is using. There's a little box in the upper left corner. If it's not checked, just touch it and the check should appear. Hold down the back button till you are at the main screen. Voi la! He also recommended sitting the Garmin outside and turned on and then not moving it for about 40 minutes. I hope it's that easy for you!
The only way to update the maps is to purchase new maps from Garmin and download them via the computer. The 2008 map updates are currently available, and Garmin has told me new maps will be out in a few months.
My Garmin c350 has a green screen after trying to update it for the first time and my computer will not read that it is connected.
It will not shut off after holding the power button down for 3 minutes