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Your MicroSD card may be full just from the basic maps. Try larger card for additional maps. The vendors supply the minimum to keep the cost low and then force the customer to upgrade the resources at their own expense.
You need Garmin MapSource (Trip and Waypoint Manager) and a data cable. Then for free maps visit the murky internet sites and beware of what you download. I would not bother with a topo or marine maps on a grey screen GPS anyway as the colour maps will not be easily understood on a grey screen.
You will need to load the MapSource software on your PC then load the maps into MapSource. After the maps are loaded and unlocked you can plug your GPS into your PC with the USB cable and load the maps.
There is a serial number associated with your maps and your GPS unit. You will be able to get this serial number from Garmin when you register your software. Mapsource comes with the maps on the same disc. If it is not installed on your computer, it will automatically install.
You can view segments of the maps at the Garmin site and it will show you how much detail there is. Go to http://www8.garmin.com/cartography/mapSource/topous.jsp# and on the far right side of the page, you'll see a link to Mapsource Map Viewer Topo USA 2008. Click on that and zoom in to your area. Yes, you can download the map segments to your unit.
Is Mapsource installed on your PC? Are you using the "Receive from Device" icon? Is your unit being recognized when you use "Receive from Device"?
If your answers are yes to all of the above, you might have to update your Mapsource programme (free of charge) from the Garmin Website. Also, updating your unit software from the Garmin site is also a good idea. Please let us know if this fixes your problem.
I had this problem today, updated the software, now the unit seems to be working perfectly. The unit "crashes" (single line down screen center) as soon as it get enough satelites to work with WAAS.
Go to Garmin site for software updates. Download and install the WebUpdater. Once or unit is hooked up to your computer and you have internet access, the software will download and update your GPS with the latest software fixes. I had software Version 3.7. For the Legend, Version 3.9 fixes the problems with WAAS.