My guess is that it's not possible. I also have a 2DIN WInCE head-unit (Rosen DS-GM1010-P11) and there is no way to access the internet with it. The iGo application is used on MANY different devices - but that doesn't mean that every iGo option is going to work on every device.
Most of these 2DIN devices use a separate "on chip" GPS module, which performs the GPS function completely separate from the rest of the device and doesn't have any way to interact with a wifi-hotspot or bluetooth or anything (even though the "main" device supports bluetooth, there is no way for the GPS application to see the bluetooth radio).
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