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Re: map down load
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.
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In Map Setup page, scroll over to blue 'ball' icon (second from right), press lower left button on side of GPS unit, use Thumb switch to scroll down to "Show None", click Thumb switch in. All maps will disappear. Press lower left button on side of GPS unit again, scroll down to "Show Topo.....", click Thumb switch in. Your Topo maps should now show onscreen.
The reason your Topo map might not have shown is because, if you leave the Navigator map showing, and then just press "Show Topo", the layer showing Topo will still be under the Navigator map. This is why I always tell it to show none, and then load whatever map I need to see onto a bare screen.
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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.
You need to have Mapsource running, select the Topo USA 2008 maps to show on your screen. Use the Map Select tool, and select all the maps you want to send to the unit. Then hit the Send to GPS at the top and a pop up window asks what you want to send. Select Maps.
If this is what you have done already, please come back and tell us and we'll trouble shoot from there.
The preloaded maps are VERY generic, mostly major highways. They are not useful for geocaching.
The good news is that you can download free topo maps created by a very generous Canadian soul, Dale Atkin. The maps are free but donations are accepted. He is also working on US topo maps. I've used Ibycus and Garmin topo maps and prefer the Ibycus version. If this solves your situation, please come back and rate our answer. Thankyou.