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Ok, take the 478 Garmin that has XM. When you put it in a truck does the XM operate off a modulator inside the unit to play through your radio? Do you have to hard wire it into the radio? Or, do you have to buy a modulator and attach it to the Garmin unit?
 

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There is no on-board FM modulator on the 478 - you'll need to connect the audio output jack to an off-board modulator (either wireless or wired to your truck's radio) if your truck radio has no AUX input available. (A cassette adapter is another option if you have a tape player).
 

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Go out and buy you set of the Bose Noise canceling headphones. I use them everyday in my van with my 376 and XM. Its awesome!
 
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