消费电子协会表示，今年美国的便携式导航设备预计将仅增加15%，达到1,740万台，而去年此类电子设备的销量猛增了73%。

Unit sales of portable navigation devices in the U. S. are projected to increase 15% to just over 17.4 million units this year, after jumping 73% last year, says the CEA.

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专家知道便携式电子设备发出辐射能影响飞机导航和通讯所用的波长。

Experts know that portable device emit radiation which affects those wavelengths which aircraft use for navigation and communication.

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专家认为，便携式的电子设备会发射出一些辐射，这些辐射能影响飞机用来导航以及跟地面联系的一定波长的电磁波。

Experts know that portable device emit radiation which affects those wavelengths which aircraft use for navigation and communication.

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