One of the new features in v10 is support for connected devices.

How can I find out if a particular device is supported by Mathematica? Is there a complete list? Is support being added continually?

The documentation says:

Many classes of devices listed in the Wolfram Connected Devices Project are immediately supported within the Wolfram Language.

Out of curiosity, I connected a Garmin nüvi50 and ran FindDevices to see if it would recognize it and be able to import tracks. I got the result:

{DeviceObject[{"Camera", 1}], DeviceObject[{"FunctionDemo", 1}], 
 DeviceObject[{"RandomSignalDemo", 1}], DeviceObject[{"WriteDemo", 1}]} 

The only device it recognized here was the built-in camera. Is FindDevices generally sufficient to find out of a device is supported, or is manual configuration necessary for some devices?