Are you sure there is a receiver in the device? I really couldn't gather that from the original post or the comments - not definitively, anyway. If they're expecting you to just use the iPod touch's WiFi - then this is INSANE to buy. If it turns your device into an actual satellite radio receiver - well, that's different.
Considering that you can only use the XM or the TOMTOM apps one at a time. I don't see this being an issue. Using the cigarette lighter plug as a mount makes it easy to switch out when you need to.
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Are you sure there is a receiver in the device? I really couldn't gather that from the original post or the comments - not definitively, anyway. If they're expecting you to just use the iPod touch's WiFi - then this is INSANE to buy. If it turns your device into an actual satellite radio receiver - well, that's different.
Considering that you can only use the XM or the TOMTOM apps one at a time. I don't see this being an issue. Using the cigarette lighter plug as a mount makes it easy to switch out when you need to.