Join Date: Aug 2005
Location: New Hampshire
Bikes: Gunnar Sport, Soma Double Cross Disc
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The 705 will work "correctly" without any extra maps, in the sense that the GPS function will still work, all the speed/cadence/heart rate/etc. readouts will still work, and it will still track your route, etc.
But as was mentioned, if you want navigation, the base map is pretty useless. I feel the best option is to get the Edge 705 bundle without maps, then go out and buy the City Navigator DVD separately along with a cheap 2GB SD card. This is a bit more complicated, but the DVD version of City Navigator allows you to install the maps both on the Edge and also on your PC. You can then use your PC to plan routes and upload them to the Edge (via the Garmin MapSource application). If you just get the version that comes on an SD card, I don't think you can transfer the maps to a computer.