It's not illegal to look at the displays on your dashboard while driving either. The difference is that the content on your TV has nothing to do with the task of driving, and typically requires your continuous attention. Satnavs provide reference information to help you drive (ignoring the video playback functions, that is). Legally you shouldn't look at them either - have you ever read the disclaimers for your satnav device?
As for smaller screens, about a month ago Sony launched 4.3" models (NV-U53 and 73T) in Europe that are basically a scaled-down alternative to the 4.8" models (NV-U83 and 93T), should you prefer the smaller screen. Remember, though, that smaller screens typically mean smaller text, and when you're trying to read something whilst driving, bigger is better.
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Some good points.
It's not illegal to look at the displays on your dashboard while driving either. The difference is that the content on your TV has nothing to do with the task of driving, and typically requires your continuous attention. Satnavs provide reference information to help you drive (ignoring the video playback functions, that is). Legally you shouldn't look at them either - have you ever read the disclaimers for your satnav device?
As for smaller screens, about a month ago Sony launched 4.3" models (NV-U53 and 73T) in Europe that are basically a scaled-down alternative to the 4.8" models (NV-U83 and 93T), should you prefer the smaller screen. Remember, though, that smaller screens typically mean smaller text, and when you're trying to read something whilst driving, bigger is better.